Which concept does the teacher reinforce when they ask about the amount of snack cups needed for students?

Asking about the amount of snack cups needed for students reinforces the concept of counting. This activity encourages students to engage in numerical thought processes by quantifying objects, which is a foundational skill in early mathematics. The focus is on determining how many snack cups are required, prompting students to count either by actual objects or by using counting strategies. This skill is critical for developing number sense and is often one of the first mathematical concepts taught in early education settings.

While measurement might come into play if the question involved sizing or quantities of the snack cups in relation to something else, the primary emphasis here is on the act of counting the number of items needed. Comparison would involve evaluating different quantities against each other, and geometry would pertain to shapes and spatial understanding, which are not central to this specific scenario. Therefore, the correct answer effectively highlights the counting process as a key teaching tool in this context.