Anushika's age is four times her son's present age and four seventh of her father's age. The average of the present ages of all of them is 32 years. What is the difference between the Anushika's son's present age and Anushika's father's present age?

Let son's age = x. Then Anushika = 4x. Father = (7/4) x 4x = 7x. Average = (x + 4x + 7x)/3 = 12x/3 = 4x = 32, so x = 8. Son = 8, Anushika = 32, Father = 56. Wait - let me recalculate. If average is 32, then sum = 96. x + 4x + 7x = 96, so 12x = 96, x = 8. Son = 8, Anushika = 32, Father = 56. Difference = 56 - 8 = 48 years. But let me verify: 4x = 32 (Anushika), 7x = 56 (Father). The phrase 'four seventh of her father's age' means Anushika = (4/7) x Father's age, so Father = (7/4) x Anushika = 7x. Sum = 96 gives x = 8, Father = 56, Son = 8, difference = 48. Option B is correct.