Correct Answer: Much

Solution : The correct answer is option 4.

Much of his passion depends on his interest

Explanation:

Any member of the group of words that modify nouns and pronouns is referred to as an adjective.
- Let's examine the definitions of the following adjectives:
- Few-a small number of
- Many-a large number of
- Less- a smaller amount of, not as much
Much is a large quantity or amount of
- Plural countable nouns are used with the adjectives "few" and "many."
- With uncountable nouns, the adjectives "less" and "much" are employed.
- The adjective "much" is a suitable choice because "less" doesn't fit the context because the noun "passion" is an uncountable noun.