[Q]: How does the sentence end?

Nelson stayed home from work and Kevin did not because

[A]: Nelson had not built an immunity to the common cold.

[Q]: How does the sentence end?

Family pictures are better taken outdoors in the yard rather than indoors in the building because in the

[A]: building there is worse lighting.

[Q]: How does the sentence end?

Ian didn't know what to do about the situation while Steven was ready to go with an answer.

[A]:
Ian was confounded.