In which sentence does the underlined infinitive phrase function as a subject?

Question

A.
To quickly move large groups of people is the purpose of public transportation.

B.
The commuters were excited to ride on the new high-speed trains.

C.
The goal of the new train station is to move more trains from the station to the city.

Answer 1

The sentence in which the underlined infinitive phrase functions as a subject is:

A. To quickly move large groups of people is the purpose of public transportation.

Here, "To quickly move large groups of people" acts as the subject of the sentence.