The grolier encyclopedia of science and technology is a a. subject specific encyclopedia. b. general encyclopedia. c. science index. d. scientific journal.

In my opinion, the correct answer is A. subject specific encyclopedia. Its very name tells us that it's an encyclopedia, so it can't be a science index or a journal at the same time. On the other hand, its field is a specific one because it deals with science and technology. It is not a general encyclopedia, such as Britannica or Wikipedia.