(A) 73
(B) 34
(C) 98
(D) ** 74
EXPLANATIONS BELOW
Concept note-1: -In America, one researcher found that you are considered old at 70 to 71 years of age for men and 73 to 73 for women.
Concept note-2: -Hence, the present age of the man is 42 years and the present age of the son is 10 years.