Which answer uses a participial phrase correctly to further describe the subject of the sentence? 1.Worried that he would be late, Christopher crammed books into his backpack.
2.Wondering about the end of the story so Anna read the last page.
3.Elena, always criticizing her friends.
4.Serving on the student council, this semester is busy for Paul.

1. Worried that he would be late, Christopher crammed books into his backpack.

Explanation:

Participial phrases are those phrases that contain the participle form of the verb, modifying the subject in the sentence. This means that participial phrases are the modifiers of the nouns or pronouns of the sentence.

Among the given sentences, the sentence that correctly uses a participial phrase and describe the subject is sentence 1. In this sentence, the phrase "worried that he would be late" is the participial phrase that describes the subject "Christopher".

Thus, the correct answer is option 1.