Problem: How does the sentence end?

My shampoo did not lather easily on my Afro hair because the 
OPTIONS:
- shampoo is too dirty.
- hair is too dirty.
Answer: hair is too dirty.

Problem: How does the sentence end?

It was easier to calculate the taxes for the diner than for the store because the 
OPTIONS:
- store was a bigger business.
- diner was a bigger business.
Answer: store was a bigger business.

Problem: How does the sentence end?

Following the advice from the chef, Mary used a wooden cutting board to cut meat instead of a plastic cutting board, even though the 
OPTIONS:
- wooden cutting board is porous.
- plastic cutting board is porous.
Answer: wooden cutting board is porous.

Problem: How does the sentence end?

Joel had to borrow dish liquid from Kyle because 
OPTIONS:
- Joel had went to the store when they were out.
- Kyle had went to the store when they were out.
Answer:
Joel had went to the store when they were out.