The correct option is A a
Most proper nouns do not need an article, but there are exceptions. Like in the given sentence, 'Moses' does not refer to the prophet himself, but in a metaphorical sense, his qualities as a leaderare referred to. Hence option A is correct. Option B is incorrect because the noun does not begin with a vowel. Option C is incorrect because there can only be one Moses, and 'he' cannot be someone else, except metaphorically. Option D is incorrect because it's used for nouns which are nearby and the noun mentioned is physically impossible to be nearby..