Students in a second-grade class are practicing how to solve word problems involving the addition of single-digit whole numbers. Which of the following word problems is most appropriate for the teacher to use for the activity?
A. "Solve for x in the equation 2x + 3 = 7."
B. "Calculate the area of a rectangle with given dimensions."
C. "If Sally has 3 apples and gives 2 to her friend, how many apples does she have left?"
D. "Explain the concept of multiplication using real-world examples."
