How would you write a real-world problem that models the following equation: -x + 40 = x? (1 point)
A. If Alex gained as much money as she lost, she would have 40 dollars.
B. The amount of money, a stock lost in the stock market was $40 more than it gained.
C. Marsha is below sea level. To get as far above sea level as she is below, she would have to move to a location 40 feet higher.
D. The number of days that the temperature has been below zero is 40 fewer than the number of days the temperature has been above zero.