B. TOM WON THE RACE.
This is the sentence where race is used as a noun.
A noun is a word that denotes a person, place, or a thing. It answers the questions who and what in that sentence.
In the above sentence, tom and race are both nouns.
Who won the race? TOM
What did Tom win? the race.
The Socs and greasers choose to have the rumble in a vacant lot in greaser territory, because the lots is a less conspicuous place where they hoped the cops would not break up the fight.