3. Which of the following sentences has a compound predicate?

A. She raced along the path to beat him to the beach.
B. She placed the shells in a plastic bag while he dried himself off.
[C. She washed the shells and dried them in the sun.]
D. While he swam, she collected shells.
let me know if my answer in the brackets is correct

Correct.

Yes, your answer in the brackets is correct. Sentence C, "She washed the shells and dried them in the sun," has a compound predicate.

To determine whether a sentence has a compound predicate, you need to identify if there are two or more actions or verbs connected to the subject of the sentence. In sentence C, we have two actions: "washed" and "dried." The subject "She" performs both actions. Therefore, sentence C has a compound predicate.