Answer:
She should create a table with three rows and two columns.
First row: Class 1
Second row: Class 2
Third row: Class 3
Column 1: Water Color
Column2: Oil Paint
In the first box of column 1, she should place the number of students who prefer water color in class 1.
In the second box of column 2, she should place the number of students who prefer water color in the class two.
In the third box of column 3, she should place the number of students who prefer water color in class 3.
Explanation: