Topic: Article,

Best Answer Explained in Below-:

The correct answer to the question, 'Mr. Robin is __ humorist.' is A) a. This stems from the grammatical rules governing the use of articles in the English language.

In English, the indefinite articles "a" and "an" are used to refer to a non-specific item within a category. The choice between "a" and "an" depends on the sound that follows the article. "A" is used before consonant sounds, while "an" is used before vowel sounds.

In this case, "humorist" begins with a consonant sound (/h/), so we use "a" before it. Therefore, we say "a humorist." The other options don't fit appropriately: "an" cannot be used here because "humorist" does not start with a vowel sound; "the" implies a specific humorist that has already been mentioned, which isn't the case here; and "no article" would be incorrect because we need an article to indicate a singular countable noun in this context.

Thus, "Mr. Robin is a humorist" properly conveys that Mr. Robin is one member of the broader category of humorists, making option A the correct choice.