Problem: How does the sentence end?

We returned the drill and opted to purchase a hammer, since the 
OPTIONS:
- drill was useless for our building project.
- hammer was useless for our building project.
Answer: drill was useless for our building project.

Problem: How does the sentence end?

Jill wanted to fit her new book into her new backpack , but it did not fit the 
OPTIONS:
- backpack was too small.
- book was too small.
Answer: backpack was too small.

Problem: How does the sentence end?

James found that the tank was surprisingly easy to operate and not the vehicle because the 
OPTIONS:
- tank had simple controls.
- vehicle had simple controls.
Answer: tank had simple controls.

Problem: How does the sentence end?

Christine likes to go to the beach but Amy likes to go to the mountains, so 
OPTIONS:
- Christine booked a trip to Aspen.
- Amy booked a trip to Aspen.
Answer:
Amy booked a trip to Aspen.