Select the correct and entire subordinate clause of the sentence.
amateur sports must become better organized if the u. s. wishes to be more competitive internationally.
the subordinate clause is

true. the definition explains it: a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. this is a dictionary definition that i have looked up in a dictionary.