Answer:
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.