How old was Gandhi and his bride when they were married?

They were both thirteen.
They were both fifteen.
He was thirteen and she was fifteen.
He was fifteen and she was thirteen.

Which sentence uses parallel structure? a. spring is a time for growth, renewal, and to rain. b. science provides us with some answers, some questions, and figuring out how our world works. c. as long as you use your best judgement, learn from your mistakes, and taking advice, you’ll grow as a person. d. once things are done, there is no need to dwell them, to worry about them, or to decide who to blame.