Quantitative Aptitude Ratio and Proportion Age

In a family, the age of father, mother, son, and grandson are A, B, C, and D respectively. Given that A - B = 3, B + C = 78, C + D = 33 and the average age of the family is 34 years, then (B - C) is:

1

19

2

20

3

21

4

22

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