C.
Looking at the animals is my favorite part of visiting my uncle's farm in Vermont.
3.2 - 5.1n - 3n + 5 = 3.2 + 5 - 5.1n - 3n = 8.2 - 8.1n
Adverbial clause is an adverb which is a dependent clause. It's used as an adverb in a sentence to show the time, contrast, conditions, place, reason, concession, purpose or result.
Hope i helped!
D object of a preposition