Multi-select problem: How does the next paragraph end?

Scientist writes a formula on a board, then the scientists run and jumps in the water. Then, people water ski in the water pulling by a boat. a woman water ski

Possible answers: (i) while two men explains the movements made by the girl. (ii) under thesand the boat pass a boat in the water. (iii) and jumps underneath the boat. (iv) in a lake that has waterfalls.
(i)