Final answer:
Li's father is most strongly described as being thrifty in the first paragraph, as evidenced by his practice of saving and reusing orange and tangerine peels as a cold remedy.
Step-by-step explanation:
The statement about Li's father that is most strongly supported by the first paragraph is that he was thrifty. The paragraph describes how Li's father saved orange and tangerine peels, stored them, and used them as a homemade remedy for coughs and colds instead of purchasing medicine. This behavior is a clear example of thrift, which is being frugal and avoiding waste. While oranges may not have been the father's favorite fruit and there's no mention of an orange grove owned by him or about Li's daughter suffering from debilitating illnesses, the notion of thrift is directly mentioned and supported by the father's actions.