阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选出最佳选项。

It was sunny. A small boy and his father (41) a walk in the country. It suddenly began to rain hard. They didn’ t have their umbrellas (42) them and there was nowhere to hide from (43) rain, (44) they were soon (45) . As they walking (46) through the rain, the boy (47) his father and asked him, "Why does it rain, Father It isn’ t very nice, isn’ t it" " (48) very nice, but it’ s useful, Tom," (49) his father. "It rains to make the fruit and the vegetable grow for us," Tom thought about this for a moment, and then he said, "Then, why does it rain on the road (50) , Father"