Answer:
It is an indefinite pronoun
the answer is a . " the crisp and refreshing air , the brilliant blue sky , and the snow all added up to a picturesque winter day .
Lake Pitch is the world's largest natural asphalt site, which is estimated to contain 10 million tons. It is located in La Brea in the southwest of Trinidad, within the Siparia Regional Corporation. The lake covers about 100 acres and is reported to be 250 feet deep. [1]
Pitch Lake is a popular tourist attraction, including a small museum, from where official tour guides can accompany people across the lake. The lake is extracted from asphalt by Lake Asphalt of Trinidad and Tobago.
D because it is comparing two things for clarification.
