d. plantations required a large work force, and slavery was a cheap and easy way to fulfill labor needs.
Definitely Whispered, because he quietly leaned over<span />
Yes it is a expository writing
Consider the following conditional sentences, and pay close attention to the conditional verbs in each of them:
If my cousin had been just a little taller, he could have been a basketball player.
If I had enough money, I would travel around the world.
If Alex finishes his essay, he will come over tomorrow.
After looking at how a conditional verb is used in a sentence. I would say that Conditional is the correct answer.