which situation represents a proportional situation? a. during shaina's run, she runs 2.5 miles at 6.5 miles per hour. b. after a bath, a bathtub has 72 gallons of water in it, and it drains 8.5 gallons per minute. c. for a charity run, one sponsor will donate $2.50 per mile melissa runs, and another will donate $3.50 per mile melissa runs. d. at a bowling alley, bowling costs $8.75 per hour, and a game of mini golf costs $7.50.