What happens next in this paragraph?

One person in particular comes down the slope holding a child in front of them before finally letting them go. The young child is freely skiing but the adult is trailing close behind them. as they
Select from the following.
(a). go downhill the child has difficulty skiing because he falls over, and people fall supporting the child..
(b). continue, they encounter another pair of people doing the same thing..
(c). pass by a bicycle many other skiers are not far behind..
(d). continue going down the mountain, other people are skiing too and picking them up as they go..
(b).