Final answer:
The bolded group of words is a clause because it contains both a subject and a verb, where 'the elevated flower beds' is the subject and 'display' is the verb.
Step-by-step explanation:
The group of words in bold, "the elevated flower beds that display Jasper's prize roses," is a clause. A clause is defined as a group of words that contains both a subject and a verb. In this case, the subject is "the elevated flower beds" and the verb is "display." This differentiates it from a phrase, which lacks either a subject or a verb.