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 ratio of the number of pens sold by shop A in months 1st and 3rd together to the number of pens sold by shop B in months 2nd and 4th together.

Options

A. `27:28`
B. `28:29`
C. `29:30`
D. `26:27`