Answer:
Since you're getting up early
B. It answers the question why and modifies the verb take.
Step-by-step explanation:
The first part of the adverb is to answer a question while why it is used to modify the verb. Therefore modifiers are employed as an independent clause, and they do not form a complete and grammatical sentence with the support of other words. For instance, the above words do not constitute a conviction because of the nature of the adverb.
In other words, when adverbs are incorporated in a sentence, they lack any effect; instead, they only modify the verb by giving a reason.