Well mostly they are: I, me, we, us, my, mine, our, ours, myself, ourselves.
Answer: A. Explicit.
Explanation: Explicit means something fully revealed or expressed without vagueness, implication, or ambiguity, it is the opposite of implicit (something suggested but not communicated directly). So the definition "words or ideas that are clearly expressed and leave no question as to their meanings" is referring to the meaning of "explicit", therefore the correct answer is the corresponding to option A.
Based on the Schenck v. United States case, it might be acceptable for the government to restrict information released by the press if the government can only restrict information that could present an immediate threat to security or the public.