Ok, because many of you chosen B so here's the answer....it's... A good ending ;)
Surprised?
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Your POV :

You're confused after the call from Mabel. What shall I do now? Maybe Will could help me! As you thought, you borrowed Pacifica's bike and ride straight to the Gleeful's place.

You knocked the big door, but there's no answer.

Strange...

You pushed the door, it opened!

'Don't they lock it?' You spoke to yourself in wonder. 'Will? Are you here?' You called his name but only received echoes of your voice. How strange it is, you keep walking around the house looking for a sign of life. Silence as the grave.

You were about to go home but them, you heard a sobbing.

Could it be Will?

You follow the weak voice, it leads to a door. The door looked old and there are starches on it. You stomach started to growls, it's feel like you're gonna throw.

What is that smell? Blood?

You took all the bravery and opened the door, there were stairs and a small lights ball. You walked down, it's a basement...

!!! Will!?

With a trembling fear, it's Will, he's bleeding!

'Will! W-what happened to you!?' You ran near to him, trying to untied him from the chains.

Will's POV:

I heard (y/n)'s voice, I must imagined it. It couldn't be...I tried to open my eyes, hoping that it's not her but...she is here...

'(Y/n)...you shouldn't be here...p-please...run away!' I took all the strength I had now to told here to run, it's not safe for her to be here...

'Run? Yeah, I will run but not without you!' She spoke strongly even she's just a little girl. What a strong girl...

'Damn it, how can we take this off!?'

'You can't ' another voice spoke to us, I took my eyes off (y/n) to see who it was. Mabel Gleeful...

'Mabel! You got to help us!' (Y/n) ran to Mabel.

Mabel close her eyes and used the amulet to untied me. She was trying to help us but, her eyes seems like...she is afraid of something...like she had done something wrong...

'Both of you, go! I'll took care the rest!' Mabel point to another door at the corner, it's the secret exist!

'Okay! But, Mabel, took care!' I said, I shouldn't said that...to my master...

'Thank you, Mabel...' (Y/n) said a went first.

After that, I turn back and hugged Mabel tightly. 'Thank you, Mabel' and she hugged back, 'go to your love, you coward...'

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Whelp, that's enough for today ! A little Mawill in it... :P

For answer A:

If you tried to run away, Dipper will chase after you and the would be nobody there to help you. Totally trapped :)))))))))))))) sounds funny and weird but...he will rape you -////- thank goodness that not most of you chosen that! Cause I'm not good at lemons. Phew!

For answer C:

You don't care a still stayed at the Mystery Shack, Dipper will come to your place and murder everyone who trying to get on his way. This will be a yandere ending ;)

Have fun!