Answer:
C. What is the weight of each student in my class?
Explanation:
Since for measuring the central value and variation, we need data. And the data can only be collected in option C. Because weight of each student in a class will give the large numerical data of size equal to number of student in the class.
Options A, B and D are incorrect as it is only give one numeric value and central value or variation can't be calculate using a single variable.