Final answer:
The sentence 'Susan climbed up the stairs, opened the door, and turned on the light' is an example of parallel structure because it uses the same past tense forms of the verbs consistently, providing clarity and balance to the sentence.
Step-by-step explanation:
An example of parallel structure occurs when elements in a sentence are presented in the same grammatical form to show that they are equal in importance. The correct sentence with the parallel structure from the options provided is "Susan climbed up the stairs, opened the door, and turned on the light." In this sentence, the past tense verbs 'climbed,' 'opened,' and 'turned' follow a parallel format, which creates rhythm and clarity in writing.