Justin pounded down the sidewalk as he ran. the run was terribly tough because he was heaving his giant backpack. however, justin had no other choice but to run fast and hard. mr. peterman's doberman was on the loose again and terrorizing all of the kids walking home. fortunately, justin was almost safe at home. which sentence from the passage uses an infinitive?

a. fortunately, justin was almost safe at home.
b. mr. peterman's doberman was on the loose again and terrorizing all of the kids walking home.
c. the run was terribly tough because he was heaving his giant backpack.
d. however, justin had no other choice but to run fast and hard.