Correct Answer: D
Explanation:
The subject of the sentence, "Malik and his friend Jugnu," is plural. Therefore, the sentence must use a verb that agrees with a plural subject. So, "are" needs to be used instead of "is." In choosing between "are a type" and "are a types," the phrase "a types" is grammatically incorrect because "a" is an indefinite article used with singular nouns, and "types" is a plural noun. Plus, you can see that the sentence is discussing one type of person "called introverts"—there is no discussion provided of any other type of person, so using the plural "types" would not make sense in the sentence's context. So, "are a type" is the correct answer.