Pool owners who live in Los Angeles or Miami can splash around all year . But for those who live where winter is on the way , closing is a necessity . The process involves several steps , Mr. White said , some of which may be better left to a professional .

Question: What may be the reason they can splash around all year ?
Answer: None of the above choices .Those two cities have pools that resist colder weather .Those two cities host a pool party during the winter year .Those two cities have much colder climate for pools .