Concept:Understanding the meaning of synonyms and antonyms to choose the most appropriate word for a given context.Explanation:We need to find a word that best describes Renu's father's income, given that it is "not much". Let's look at the meanings of the options provided:1. Grand: Means magnificent, large, or impressive. This doesn't fit if the income is "not much".2. Sole: Means only, single, or individual. If Renu's father is the only one earning, or if his income is the only source, this word can be used. It also implies independence.3. Joint: Means shared by two or more people. This would imply that the income is not solely from Renu's father, which might contradict the context.4. Huge: Means extremely large or enormous. This is the opposite of "not much".Considering the context that Renu's father's income is "not much", and the options given, the word "sole" is used to emphasize that it's his individual income, perhaps the only one supporting the family, and not a large or shared income. The sentence structure implies we are describing the nature of his income as the primary or only source.Answer:sole