[Q]: How does the sentence end?

The ditch provided a strong defense against the horde's attack, while the wall fell instantly, as the 
OPTIONS:
- ditch was vulnerable to their attack.
- wall was vulnerable to their attack.

[A]: wall was vulnerable to their attack.


[Q]: How does the sentence end?

I wanted to learn origami, but I couldn't find the paper or a book that worked for me.  Eventually I bought the 
OPTIONS:
- book and read it.
- paper and read it.

[A]: book and read it.


[Q]: How does the sentence end?

We could not put the turkey that we bought for Thanksgiving in the fridge, because the 
OPTIONS:
- turkey was small.
- fridge was small.

[A]:
fridge was small.