Direction: The given bar graph shows the number of pens sold by two shops A & B in four consecutive months. Study the following data and answer the following questions:

Find the average of the number of pens sold by shop A in 1st and 3rd months and the number of pens sold by shop B in 3rd and 4th month together.

Options

A. 75
B. 85
C. 72
D. 78