I think it’s “ Swimming swiftly, was the only way for the dolphin to stay with its pod “
The answer to your question would be that the sentence that uses two prepositional phrases is the following one: The helicopter landed among the cars in the parking lot. The two prepositional phrases in the sentence are "among the cars" and "in the parking lot".
A prepositional phrase is a group of words made up of a preposition and its object. The object may be a noun, a pronoun, a gerund or a clause. What is more, a prepositional phrase functions as an adjective or adverb.
Answer:
According to one version of the story, Laius, king of Thebes, was warned by an oracle that his son would slay him. ... Continuing on his way, Oedipus found Thebes plagued by the Sphinx, who put a riddle to all passersby and destroyed those who could not answer. Oedipus solved the riddle, and the Sphinx killed herself.
Explanation: