Read the excerpt from "Through the Tunnel" and answer the question.

There was no one visible; under him, in the water, the dim shapes of the swimmers had disappeared. Then one, and then another of the boys carne up on the far side of the barrier of rock, and he understood that they had swum through some gap or hole in it. He plunged down again. He could see nothing through the stinging salt water but the blank rock. When he carne up, the boys were all on the diving rock, preparing to attempt the feat again.

Which sentences below include only prepositional phrases (no participial or absolute phrases and no dependent clauses)? Select two answers.

When he carne up, the boys were all on the diving rock, preparing to attempt the feat again.
There was no one visible; under him, in the water, the dim shapes of the swimmers had disappeared.
He could see nothing through the stinging salt water but the blank rock.
Then one, and then another of the boys carne up on the far side of the barrier of rock, and he understood that they had swum through some gap or hole in it.