Question

In which sentence is the CAPITALIZED infinitive or infinitive phrase functioning as a direct object?
TO CHEER ON THE RUNNERS, the crowd gathered near the finish line.
Just as the mayor was about TO GIVE AN AWKWARD, it began raining.
TO RUN A MARATHON is hard work.
After all that exercise, the runners needed TO DRINK WATER.

Answer 1

The second choice is a fragment, not a complete sentence.
I believe the correct choice is number one, because if you turn the sentence around, it answers the question of why the crowd is gathered.  You may want to confirm on the website chompchomp.com (Grammar Bites).