Which sentences contain a restrictive clause?
1. we fed the kittens that we found in the shed.
2. my grandmother, who was growing crankier by the day, scolded him harshly.
3. this is the house that i grew up in.
4. our teacher, who was always ready to share in a good joke, laughed with us

Restrictive clauses are essential for the meaning of a sentence and are never separated from the rest of the sentence using commas, unlike the nonrestrictive ones.

The sentences that contain a restrictive clause are 1 and 3.

Because in sentence 1, The writer stated "That we found in the shed".

Also in sentence 3, The writer stated "That I grew up in".

These are important to in order to understand the whole sentence and cannot be deleted.

Good luck (: