Which word in the sentence is a participle?

Are you walking toward the barking dog?

a. dog

b. barking

c. Are

d. walking

Participle is a verbal form that is used as if it were an adjective or adverb.

So, if the verb is, for example, "to bark" the participle would be"barking" as in "this barking dog"

and the correct answer is b. barking!

The participle in this sentence would be barking, participles are basically verbs that can be used as adjectives. Here barking is describing the dog.