If you want to find the answer to a question about grammar, usage, or mechanics for your formal writing, which professional resource would not be helpful?

Essential Idioms in English
The Chicago Manual of Style
A Manual for Writers of Research Papers, Theses, and Dissertations
MLA Handbook for Writers of Research Papers

Question

If you want to find the answer to a question about grammar, usage, or mechanics for your formal writing, which professional resource would not be helpful? 

Essential Idioms in English
The Chicago Manual of Style
A Manual for Writers of Research Papers, Theses, and Dissertations
MLA Handbook for Writers of Research Papers

anonymous · Answer

I think B, maybe..?

anonymous · Answer

I would go for A. B, The Chicago Manual of Style, is a guide for writers, just as the other two are.

anonymous · Answer

I see, cause it doesn't ask for idioms and stuff.

anonymous · Answer

Exactly! :)