At a fall festival, a student council sold two types of drinks; hot chocolate and apple cider. The student council earned $1.25 for every cup of hot chocolate it sold and $0.75 for every cup of apple cider it sold. There were 375 cups of drinks sold and the total amount of money earned was $393.75. The following system of equations can be used to represent the situation: x + y =375 and 1.25x + 0.75y = 393.75 What does the variable x represent in this system of equations? A. The number of dollars earned from selling one cup of hot chocolate. B. The number of dollars earned from selling one cup of apple cider. C. The number of cups of hot chocolate sold. D. The number of cups of apple cider sold.