Question

Which sentence contains italicized words that are used as an infinitive phrase?
A. Tom went there for some flour.
B. Mark wanted to go, but not today.
C. Jane parked her car behind a truck.
D. Kelly went to the grocery store.

Answer 1

The only infinitive phrase that I can find here is this one:
to go

it is in the option B:

B. Mark wanted to go, but not today.

the other options don't have an infitininive phrase. D also has the "to" that infinitive phrases have, but it's used for a different purpose there (a preposition)

Answer 2

B. Mark wanted to go, but not today.