The author apparently believes that the “principle of government” mentioned in the last sentence is _____.
Not implicit
A. To be taken as true for all times
B. Apparently violated by the prohibition amendment
C. An essential change in the beliefs of the American people
D. Something that would bewilder Washington and Madison

Hint: An axiom or postulate is a statement that is taken to be true, to serve as a ground or starting point for further reasoning and arguments. Or it is defined as unquestionable, understood or accepted.

Complete step by step answer:
We have to find the blank with the most appropriate answer so that it gives a meaning to our sentence.
Option A) Not implicit – is an incorrect answer because it does not fit in the sentence.
Option B) To be taken as true for all time – is an incorrect answer because ‘to be taken as true for all time’ is not the right choice to be filled in the blank.
Option C) Apparently violated by the prohibition amendment – is the correct answer because in the last sentence, the author states that The Prohibition Amendment fails the principle of government which the founders thought was axiomatic (that is well accepted or understood). The amendment violates the principle of government. Thus, this is the correct answer.
Option D) An essential change in the beliefs of the American people – is an incorrect answer because ‘principle of government’ in the above statement does not mention any country. Thus, this is an incorrect answer.
Option E) Something that would bewilder Washington and Madison – is an incorrect answer because this sentence does not go well in the blank. It does not seem to give any meaning in the sentence. Thus, this is an incorrect answer.
The author apparently believes that the “principle of government” mentioned in the last sentence is apparently violated by the prohibition amendment.

So, the correct answer is “Option C”.

Note:
Axioms are statements which are accepted without questions and which do not require proof. Axioms are used as a starting point for reasoning or arguments (usually in logic or mathematics). This means we cannot prove within the discussion of a problem. For examples: According to the axiom, all men have equal worth (axioms are such that people consider this as a rule or principle and consider this as true).