Write the next sentence in this paragraph:

Some people are jumping up and down at a trampoline park. soon

OPT: a. they all hop off of the trampoline and begin to skip and jump over pieces of metal attached to cracks on the trampoline.. b. after he helps people with their trampoline springs and flips.. c. , yellow and blue lights start flashing and people begin walking around a street.. d. , they begin to throw balls back and forth at each other while jumping on the trampoline..
d.