How old are you, Mr. Brown?Im more than eighty.And how many

How old are you, Mr. Brown?
Im more than eighty.
And how many sons have you got?
You want to know a lot, dont you? Well, let me tell you this. Each of my boys has as many
sons as he has brothers, and Ive got as many sons as grandsons, added together, as Ive got years in
my age.
Thank you very much, Mr. Brown. Thats all I wanted to know!
How old was Mr. Brown? How many sons had he? And how many grandsons?
A) 90 years old, 9 sons, 15 grandsons.
B) 75 years old, 10 sons, 23 grandsons
C) 81 years old, 9 sons, 72 grandsons
D) 91 years old, 5 sons, 11 grandsons