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DIRECTIONS (Qs. No. 15 to 18): Given below is a bar graph showing the heights of six mountain peaks.     Read the bar graph and fill in the blanks by choosing the correct option.

When the heights of the given peaks are written in ascending order, then the average of the middle two peaks is -

A)  7950m           

B)           7560m

C)  7650m           

D)           7850m