In which sentence does the first word of the capitalize noun clause function as an adverb?

We were waiting to find out WHO WAS THE STARTING PITCHER.
Because of a rain delay, we did not know When The Game Would Start.
The announcer let us know That The Rain Would Force A Cancellation Of The Game.
Whoever Would Pitch In The Game had a tough battle against the best hitters in the league.

Question

In which sentence does the first word of the capitalize noun clause function as an adverb?

 	
	We were waiting to find out WHO WAS THE STARTING PITCHER.
	Because of a rain delay, we did not know When The Game Would Start.
	The announcer let us know That The Rain Would Force A Cancellation Of The Game.
	Whoever Would Pitch In The Game had a tough battle against the best hitters in the league.