What percentage of teens and young adults have retail jobs?

d. 19%

The answer is "After hiking for hours, the hikers saw the rest area appear in the near distance"

Explanation:

In writing for a sentence, paragraph or text to be considered as correct it needs to follow grammatical rules and also include ideas and thoughts that are clearly expressed, in the case of the sentence "After hiking for hours the rest area appeared in the near distance" the sentence is grammatically correct but the writer has not stated who or what performs the action of "hiking" and also the verb "appear" seems to be ambiguous as it is not common for places or objects to just appear.

Because of this, in this sentence a subject or agent that performs the action needs to be added but preserving the essence of the sentence and avoiding grammatical mistakes and therefore, the best revision is "After hiking for hours, the hikers saw the rest area appear in the near distance" because this shows the agent that performs the action, omits the use of "appeared" and also is the only sentence that is grammatically correct, complete and preserves the main idea.