Which sentence contains parallel elements?
carina thought the rolling thunder was so frightening.
carina thought the rolling thunder sounded like small explosions.
carina could hear the rolling thunder and the howling winds.
carina could hear the rolling thunder as the sky grew darker.

A parallel structure is employed when the writer has two or more elements in a sentence equally important; and in order to show that the elements are equal, these are usually joined by the coordinating conjunctions or the correlative conjunctions and should be structured grammatically the same. So, according to that explanation, the correct sentence is option C.

"Carina could hear the rolling thunder and the howling winds." is the sentence that contains parallel elements since both elements are jpined by and, a coordinating conjuntion.

- a.) the man dies after he is unable to keep a fire lit.