The correct answer is A.
A compound predicate is "two or more verbs or verb phrases that share the same subject and are joined by a conjunction."
Option A has one subject -she- performing two actions: washing and drying the shells.
Options B and C have two subjets: he and she; and option D has only one action followed by an adverbial.
A. She washed the shells and dried them in the sun
Which of the following sentences contains a compound predicate?
✔️D-"She raced along the path to beat him to the beach"
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The sentence is “She washed the shells and dried them in the sun”. A compound predicate actually consists of two or more than two verbs having the same subject and joined by any conjunction like “or” or “and”. As far as the given sentence is concerned, we see that “She” is the subject and the subject is doing two different things. This is the reason behind taking this sentence as a compound predicate.