The height of the water is increasing at a rate of 2 inches per minute. Thus, the correct option is A.
A slope also known as the gradient of a line is a number that helps to know both the direction and the steepness of the line.
The slope of the given points can be written as,
m = (12-8) inches /(4-2) minutes = 2 inches/ minutes
Hence, the height of the water is increasing at a rate of 2 inches per minute. Thus, the correct option is A.
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