Answer:
The correct answer is option C.
Step-by-step explanation:
The word "anxiously" is an ADVERB since it ends with the suffix "-ly" and it is DESCRIBING THE WAY in which the father-to-be is waiting for the news. It is an adverb of manner.
Adverbs can be classified as:
Adverbs of manner: they answer the question HOW?
Adverbs of time: they answer the question WHEN?
Adverbs of place: they answer the question WHERE?