Which of these sentences includes an infinitive phrase? a. he fell into the river and waited until they pitched the tent to change his clothes. b. when i saw what was in the box, i thought back to the very first time i played softball on a league. c. by the time i'd made it to algebra class, i had worked myself up into a tension-filled frenzy. d. my closet is empty except for my cheerleading outfit and the jade green formal i wore to the prom.