I know nothing regarding this matter. Here 'regarding' is a _. ?

In the sentence "I know nothing regarding this matter," the word "regarding" functions as a preposition. Prepositions are words that link nouns, pronouns, or phrases to other words within a sentence, often indicating relationships in terms of time, place, direction, or context.

In this example, "regarding" establishes a relationship between "nothing" (the object of the verb "know") and "this matter" (the topic of knowledge). It effectively introduces the idea of the subject matter in question, indicating that the lack of knowledge pertains specifically to "this matter."

To further clarify, "regarding" can be viewed as synonymous with "about," which is another common preposition. This usage demonstrates its role in providing additional context about what is being discussed or referred to.

In contrast, the other optionsgerunds and conjunctionsdo not fit here. A gerund is a verb form functioning as a noun, while a conjunction connects clauses or sentences. Apposition, on the other hand, refers to a noun or noun phrase that renames or identifies another noun. Therefore, "regarding" is correctly identified as a preposition, making option B the right choice.