Choose the sentence in which the article is used incorrectly:

The correct answer is Option (1) → Aman is only person in our building who owns a telescope.

“The” before “only”:

The given sentence says “Aman is only person”. This is wrong. When “only” comes before a noun to mean “the one and no other”, it needs “the” before it. Aman is the one person in the building with a telescope, so the sentence must say “the only person”.

Corrected: Aman is the only person in our building who owns a telescope.

Why the Other Options are Incorrect?

Option 2: Thousands of tourists visit the Qutub Minar every day. This sentence is correct. “The” comes before the name of a famous building or monument, such as the Qutub Minar.

Option 3: The sky turned pink just before the storm. This sentence is correct. “The” comes before a thing there is only one of, such as the sky.

Option 4: A few of my classmates came to the station to see me off. This sentence is correct. “A few” means “some, a small number”. Here some classmates did come, so “a few” is right.