4.1.2 However, [when we look at the 100 billion stars in our galaxy (the Milky Way),and 100billion galaxies in the observable Universe], it seems inconceivable that at least one of these planets does not have a life form on it.when we look at the 100 billion stars in our galaxy (the Milky Way),and 100billion galaxies in the observable Universe is used as ( ).
A. an adverbial clause of time
B. an adverbial clause of concession
C. an adverbial clause of venue
D. an adverbial clause of manner
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