Multi-choice problem: Continue writing the next sentence in this paragraph:

A young man is rappelling up the side of a cliff. Another man watches and helps from below. the man

a). continues climbing until he reaches the top.;
b). is rappelling down the cliff using ropes.;
c). makes a complete 360 turn in the air before coming back to the top of the cliff.;
d). lets go from the rope, and is seen again.;
a).