Question

is the group of words in bold a phrase or a clause? the most successful advertising slogans are those that have the ability to endure, such as \just do it\ or \when you care enough to send the very best.\ phrase clause

Explanation:

A phrase is a group of words without a subject - verb combination, while a clause has a subject and a verb. "The most successful advertising slogans" is a noun - phrase, it has no verb.

Answer:

phrase