Morena, a scuba diver, used the expression below to describe her position in relation to sea level. 0 + (–15) + 6 which statement could describe the diver’s movements?
a. morena started at 15 feet below sea level, then dove down 6 more feet.
b. morena started at 15 feet above sea level, then dove down 6 more feet.
c. morena started at sea level, dove down 15 feet, then dove down 6 more feet. d. morena started at sea level, dove down 15 feet, then rose up 6 feet.