What type of clause or phrase is italicized in the sentence below?

Whenever I can come will be soon enough for the race.

past participial phrase

noun clause

adverb clause

nominative absolute

elliptical clause

Verified Answer :

Adverb clause. Because an adverb usually follows a main clause. But in your cause the clause is in the beginning so it is called an introductory clause. 

Answer:

adverb clause

Explanation: