Restrictive clauses have three main characteristics:
They are adjectives, meaning that they modify or gives further detail of nouns.
They are not set off by commas.
They are essential to the full meaning of the sentence: Without a restrictive clause, the meaning of a sentence would change, or the sentence would be incomplete and vague.
Number 1 and 3 has all those characteristics because none of them are set off by commas, number 1 describes the noun "the kittens" and number 2 describes the noun "the house", and if these clauses were removed from the sentences, the sentences would seem incomplete.
Pre-reading activities may be one of the most important assets when you're trying to understand what you're reading. It helps you connect what you're learning to what you already know. The answer would be: False. Hope this helps! :)