Which sentence contains an adjectival clause?

A) Melinda chose the calendar that had puppies on it.

B) The woman and her children boarded the bus.

C) Chicken with noodles is Harry's favorite.

D) Four games out of seven had already been played.

A). Melinda chose the calendar that had puppies on it.

Explanation:

An adjectival clause also known as the relative clause is demonstrated as the subordinate clause that primarily functions to modify the noun or pronoun like an adjective (in a phrasal form) in the sentence. These clauses begin with a relative pronoun/adverb and are dependent on the principal clause to accomplish its meaning.

In the given question, option A employs an adjectival clause 'that had puppies on it' as it justifies all the characteristics mentioned above like beginning with a relative pronoun 'that', functioning to describe the noun 'the calendar', and reliant on the principal clause to accomplish its meaning. The other options do not contain a relative clause as reflected by no use of 'relative pronoun/adverb'. Therefore, option A is the correct answer.