Correct Answer: any

Solution : The correct answer is option 4.

Any student can be successful with his hard work

Explanation:

Any member of the class of words known as adjectives modifies nouns and pronouns, usually by describing a specific quality of the word they are modifying.
- Let's examine the definitions of the following adjectives:
- - many-a large number of.
- a lot of- a large amount or number of people or things.
- few-a small number of.
- any - used to denote any quantity, whether it be a small quantity or a large quantity.
- The first three answers pair the adjectives with plural countable nouns.

Since "Student" is a singular countable noun, "any" will be the most appropriate adjective.