How is the underlined prepositional phrase functioning in the following sentence?

our dog runs in circles when we come home.

question 6 options:

a)
adjective phrase modifying "dog"

b)
adverb phrase modifying "runs"

c)
adverb phrase modifying "come home"

d)
adverb phrase modifying "when

The prepositional phrase in circles is used as B. adverb phrase modifying "runs."
Adverb phrases modify the verb of the sentence, which means that A and D are incorrect. Since the phrase answers the question How do the dogs run? and says - In circles, it means that it describes the verb to run.

The answer is

Explanation:

The author's motivations for writing as it makes the writing more interesting and encourages young people to write.

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