I believe that the answer is c. but it could be d.
Try to use context and that should help you but if u still dont get it try reading an updated version of it.
fingerbreadth is a good synonym for "Inch" used in a sentence, If there are options and this is not one of them; please comment below and tell me the options, Thank! :)
Answer: Know what you are talking about, know when it is the right time for you to talk, have materials/ notes on hand, be confident (but not overly confident), and stay calm
Explanation:
