Choose the sentence in which the adjective clause is used correctly:

The correct answer is Option (4) → The mango tree that Dadaji planted forty years ago still gives fruit every summer.

An adjective is a word that describes a noun or a pronoun, for example a tall tree, the food is tasty.

Adjective clause:

An adjective clause describes a noun. It comes right after that noun and begins with the right word: who for people, which or that for things. It does not repeat the noun with a word like “it”. Here “that Dadaji planted forty years ago” comes right after “the mango tree” and tells which tree.

Why the Other Options are Incorrect?

Option 1: The parcel which Papa sent it from Kolkata reached us only today. — Incorrect. “Which” already stands for the parcel, so the extra “it” says the same thing twice.
Corrected: The parcel which Papa sent from Kolkata reached us only today.

Option 2: Our neighbour which waters our plants is away in Nashik this week. — Incorrect. A neighbour is a person, so the clause needs “who”, not “which”.
Corrected: Our neighbour who waters our plants is away in Nashik this week.

Option 3: The girl won the poetry prize who sits next to me in class. — Incorrect. The clause describes “the girl”, but it stands far from her, after “the poetry prize”.
Corrected: The girl who sits next to me in class won the poetry prize.