The participle in the sentence is "bought". The process of identifying the participle involves recognizing a verb form that is used as an adjective or adverb. In this case, "bought" is the past participle of the verb "buy" and it functions as an adjective to describe the puppy. To find the participle, you can ask yourself, "Which word is describing the puppy?" In this case, the answer is "bought", making it the participle.
B) bought
A participle is a verb form that modifies another word (often a noun) in a sentence.