If the ratio of the number of cars (4 wheelers)sold in session 2016-2018 to the number of cars sold in 2010-2012 is 7 ∶ 8, then calculate the approximate average cars sold in all three sessions.

• A. 3.2 lacs
• B. 4.6 lacs
• C. 2.8 lacs
• D. 6.8 lacs
• E. 7.4 lacs