Choose the option which is grammatically correct.

The correct answer as per the official NTA Answer Key is Option (3) → I don't like such type of stories.

Note: The given answer is as per the official NTA Answer Key. However, none of the four sentences is fully correct. Option 3 is NTA's answer because it has no error of comparison, but "such type of" is itself non-standard: the correct sentence is "I don't like such stories" or "I don't like this type of story". Options 1, 2 and 4 contain errors of comparison, as explained below.

Degrees of comparison:

• The comparative (easier, hotter) compares two; the superlative (the easiest, the strongest) compares three or more.
• A word is never given two marks of comparison: no "more hotter", no "most strongest".
• The things compared must be alike: the weather of Delhi with that of Chennai, not with Chennai itself.
• Option 3 makes no comparison, so none of these errors applies to it.
  Example: Mount Everest is the highest peak in the world.

Why the Other Options are Incorrect?

Option 1: Which is easier - Botany, Mathematics or Chemistry? — Incorrect. Three subjects are compared, so the superlative the easiest is needed.
Corrected: Which is the easiest - Botany, Mathematics or Chemistry?

Option 2: He is the most strongest of all. — Incorrect. "Most strongest" is a double superlative; "strongest" alone is correct.
Corrected: He is the strongest of all.

Option 4: The weather of Delhi is more hotter than Chennai. — Incorrect.

• "More hotter" is a double comparative; "hotter" alone is correct.
• The weather of Delhi is compared with a city, not with the weather of Chennai: "than that of Chennai".

Corrected: The weather of Delhi is hotter than that of Chennai.