I believe the answer is either A or D. However, I think D sounds the most fitting but like i said, it could be either one. :)
The subject of science is very broad. With that being said, I think there is no official regulatory board that decides the branches of science. Scientific developments are products of joined efforts of different scientists. These scientists could rebuke another's work provided there is evidence. As long as the theory is generally accepted by the scientists and no one rebukes it effectively, then it is a generally accepted fact and everyone adapts it.
Hence, the answer is B.
None of these is a major city in the United States.
Skokie, Illinois
Del City, Oklahoma
Harbin, PRC
Pittsford, New York
Hobart, Indiana
Kfar Tapuach, Israel
Stafford, Texas
Armagh, Pennsylvania
Dinwiddie, Virginia
Flora, Illinois
Olathe, Kansas
Mexico City, DF, Mexico
Answer:
a) Gross Domestic Product
dont confuse yourself with national income okay?
go for it!!