What happens next in this paragraph?

People are standing in a lakeside praticing how to use the rows standing next to kayaks. People on the lake is kayaking slowy. people on the lakeside
Available choices:
(A). are riding sled under a blue croquet course..
(B). are rowing a kayak in action..
(C). sits on the kayak and get into water..
(D). are standing next to rafts holding wallops in their hands and wearing green bolis aprons..
(C).