C because "the flow" of the sentence is correct. It is not too complex. Its not A because A "are the cost of" is to complex. Its not B because the use of "Noisily" in the sentence should be placed at the end, its a wrong use of juxtaposition.
Answer: a tool to help find the periodicals that contain articles on a particular subject.
A periodical index is a tool that contains the subject, author and keywords of a particular list of periodicals. This tool helps you find articles about specific topics. The way to look through an index is similar to that of looking for items in a library catalog.
The correct answer is B, nature.
They were actually opposed to all these other options, to order, hierarchy, and discipline, but valued nature as the greatest inspiration in their lives.
