In a family of four, the average age is 19 years. What will be approximate percentage increase in average age after two years ?

Option (a) is incorrect because 8% is the percentage increase in the total age of the family, not the average age.
Option (c) is incorrect because 11.2% is the percentage increase in the average age if the total age of the family is 80 years.
Option (d) is incorrect because 12.8% is the percentage increase in the average age if the total age of the family is 84 years.