Wally is playing with his toy robot. The robot's battery is 80% full when he starts playing with it. The battery drains to 74% after Wally plays with the robot for 40 minutes. If t represents the time elapsed in minutes and l represents the battery level, which of the following equations can be used to model this situation?
A. l = - 0.15 + 80t
B. l = - 0.15t + 80
C. l = 80t + 0.15
D. l = - 0.15t - 80
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