"Although many tornadoes occur throughout the United States, they are quite rare west of the Rockies" Determine the subordinate clause of the sentence

"Although many tornadoes occur throughout the United States" is the subordinate clause in the sentence.

Determine whether it is

A: Adverbial
B: Adjectival
C: Noun

The subordinate clause "Although many tornadoes occur throughout the United States" is an adverbial clause. It provides additional information about the occurrence of tornadoes and modifies the main clause by expressing a condition or concession.