Are avid readers more likely to wear glasses than those who read less frequently? Three hundred men in Ohio were selected at random and characterized as to whether they wore glasses and whether the amount of reading they did was above average,average,or below average.The results are presented in the following table. This is an r × c table.What is the value of the number r?

A) 2
B) 3
C) 4
D) 6

To determine the value of r in an r x c table, we count the number of rows. In this table, we have three categories for the amount of reading (above average, average, below average). Therefore, the number of rows (r) is 3.

Option A is incorrect because there are three rows, not two.
Option C and D are incorrect because there are not four or six rows, respectively.

Therefore, the correct answer is B, which indicates that there are three rows in the table.