Correct Answer: Most

Solution : The correct answer is option 1.

Most teachers prefer online class.

Explanation:

Adjective are the groups of words that modify nouns and pronouns.

Let's examine the definitions of the following adjectives:

Most refers to the highest degree, quantity, or amount.

Either refers one or the other of two people or things.
Whole - used to highlight a substantial amount or number
Each is a word that means every single member of a set, without exception.

The adjective must also be plural, as suggested by the use of the plural noun "teachers" after the blank portion of the sentence.
- The first option will be the correct selection because the adjective "most" is used with both countable and uncountable nouns.