Write the next sentence in this paragraph:

A man in a vest is sitting in a boat. Then the man is in the water, holding a stick and a line attached to the boat. the boat

Available choices: a. then people ski on an area of land, avoiding trees.; b. sinks, the man does a pull up toward the boat, then falls on his back.; c. is pushed in two people to the back.; d. begins to pull him in the water as he begins water skiing.;
d.