Answer:
B. (C=25m)
Explanation:
If they charge 25 dollars per month and m stands for the number of months than this would be the correct answer. Say you stayed at the gym for 1 month, you would only get charged 25 dollars and 1 times 25 equals 25. Another example, if you stayed at the gym for two months you would get charged 50 dollars because if the equation is 25m, you would replace the m with the number of months (2). This makes the equation 25 times 2 which equals 50.