[Q]: How does the sentence end?

Maria bought an expensive piece of ruby jewelry for Jennifer because
OPTIONS:
- Maria felt thankful to her.
- Jennifer felt thankful to her.

[A]: Maria felt thankful to her.

[Q]: How does the sentence end?

the toxic chemicals corroded the walls of the pipes rapidly , the
OPTIONS:
- walls were strong.
- chemicals were strong.

[A]: chemicals were strong.

[Q]: How does the sentence end?

In preparation for the hiking adventure the couple ended up buying boots while leaving out the tents since the
OPTIONS:
- boots were nonessential.
- tents were nonessential.

[A]:
tents were nonessential.