The Following Ages (Rounded to the Nearest Whole Year) of Employees

The following ages (rounded to the nearest whole year) of employees at a large company that were
Grouped into a distribution with class limits:
20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
(i. The class limits for the class 50 up to 60 class are 50 and 58.
(ii. The midpoint for the class 40 up to 50 is 45.
(iii) The class interval is 9.

A) (i) , (ii) and (iii) are all correct statements.
B) (i) , (ii) and (iii) are all false statements.
C) (ii) is correct but not not (i) and (iii) .
D) (ii) and (iii) are correct statements but not (i) .