By the mid-1870s, and his Standard oil company had monopolized
America's kerosene supply, owning over 80 percent of it.
A. Andrew Carnegie
B. J. P. Morgan
C. John D. Rockefeller
D. Cornelius Vanderbilt

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.