The sentence that uses the correct positive form of the adjective “brave” is C) During the power outage, Shelly was brave.
The positive form of an adjective is its basic form; in this case, “brave.” However, an adjective can also have a comparative and a superlative form. The phrase “Shelly is braver than Morgan” is an example of its comparative form. Furthermore, “Shelly is the bravest person” would be the superlative form of the adjective.