Answer:
2. D 4. D
Step-by-step explanation:
2. The author uses a light tone while not striving for comedy. They seem passionate about finding easier ways to get rain water. "gather up your friends! collect that rain water!"
4. It mentions in the beginning that these processes are used for landscaping and later states how easier and efficient the technique is. However the author did not say that recent solutions are bad, just that this one is a good alternative.