The correct option is B Grade 8
We can see from the table, there are 2 students absent in grade 6, 4 students absent in grade 7 and 13 students absent in grade 8.
⇒5 is represented by 4 vertical lines and 1 line that cuts the 4 vertical lines.
Hence, number of students absent in Grade 8 =5+5+3=13
∴ We can say that maximum number of students are absent in grade 8.
So, option (b) is correct.