Which sentence contains a correctly punctuated parenthetical phrase?

A) A bloated ego, for that matter, is just one of the unappealing characteristics of my older brother.

Explanation: The other ones are incorrect.

(Hope I could help :))

C. Before there was light, the animals had trouble seeing each other. Coyote and Hawk solved the problem by creating the sun and moon out of two burning balls of reeds. Because the moon was made from damp reeds, it does not burn as brightly as the sun.

Explanation:

A is way too short and very basic. It does not say much about the story.

B does not explain why "one reed ball burned brightly during the day, and one burned dimly at night."

D says simply that "Then it was light both day and night", giving the wrong impression that there was as much light at night as it was during the day.

Only C explains all of the important events in a clear and concise manner.