A researcher wants to determine if eating more vegetables helps high school juniors learn algebra. One junior class has extra vegetables and another junior class does not. After 2 weeks, the entire both classes take an algebra test and the results of the two groups are compared. To be a valid matched pair test, what should the researcher consider in creating the two groups?

That each class has similar average IQs or abilities in mathematics

That each class of students has similar ages at the time of the testing

That the group without extra vegetables receives different instruction

That each pair of students has similar IQs or abilities in mathematics