Topic: Conjugation of Verb,

Best Answer Explained in Below-:

The past participle of the verb "sing" is "sung." Understanding verb forms requires familiarity with the distinctions between the base form, past tense, and past participle.

The base form of the verb "sing" is "sing." When conjugated in the simple past tense, it changes to "sang." This can sometimes cause confusion as "sang" and "sung" are closely related in function but serve distinct grammatical purposes.

The past participle "sung" is used in perfect tenses, often paired with auxiliary verbs like "has," "have," or "had." For instance, in the sentence "She has sung beautifully," "sung" is the past participle, indicating an action that has relevance to the present.

In contrast, the other options do not represent the correct form for our query: "song" is a noun referring to a musical composition, while "sing" is the simple present form of the verb. Hence, the correct answer is B) "sung," as it accurately identifies the past participle of "sing."