Problem: How does the sentence end?

I opted to read my book in the study rather than the bedroom because the
OPTIONS:
- bedroom is brighter.
- study is brighter.
Answer: study is brighter.

Problem: How does the sentence end?

Dennis stood up in the subway car and offered his seat to Nelson because
OPTIONS:
- Dennis was sitting.
- Nelson was sitting.
Answer: Dennis was sitting.

Problem: How does the sentence end?

The carpenter was able to use a chisel to cut the wood because the
OPTIONS:
- chisel was soft.
- wood was soft.
Answer: wood was soft.

Problem: How does the sentence end?

Victoria asked Mary for some tips on a workout using weights because
OPTIONS:
- Victoria did not know the proper form.
- Mary did not know the proper form.
Answer:
Victoria did not know the proper form.