Answer:
B. at 10 o'clock; modifies is coming.
Explanation:
Adverbs are those words that modify the verbs in a sentence. They also act as an added detail in a given sentence, making the meaning of the sentence more clear or specific.
In the given sentence
The furniture store delivery truck is coming at 10 'clock
The adverb is "coming" which signifies the act of doing work of the sentence. And so the adverb that modifies the verb "come" is "10 o'clock" for it provides a specific and added detail of when the truck will be coming. The sentence can also be written as "the furniture store delivery truck is coming" which is a full sentence in itself. But with the added modifier "at 10 o'clock", the sentence becomes even more clear.
Thus, the correct answer is option B.
