I want to say A, but the length of an article or publication does not verify its authenticity or give any indication of its accuracy.
Miriam Webster defines diction as: choice of words especially with regard to correctness, clearness, or effectiveness.
So with that said, I think the clearest and most obvious answer is D, “works cited and diction.“ Diction, as noted above, is very clear and effective and offers a persuasive argument and it also provides a very clear works cited page so that references can be checked and verified by the one needing the information From the electronics stores to be as accurate as possible. I would definitely go with D.