At present, Sharad is three times as old as his son, and his daughter is 3 years younger than the son. If the sum of the ages of these three people 3 years ago was 63 years, then Sharad's present age (in years) is:

The correct option is 45.

Step 1: Define the variables for present ages
Let the present age of Sharad's son be $x$ years.
According to the problem:
Sharad's present age = $3x$ years
Daughter's present age = $x-3$ years

Step 2: Determine their ages 3 years ago
Sharad's age 3 years ago = $3x-3$ years
Son's age 3 years ago = $x-3$ years
Daughter's age 3 years ago = $(x-3)-3=x-6$ years

Step 3: Set up the equation based on the given sum
The sum of their ages 3 years ago was 63 years.

$(3x-3)+(x-3)+(x-6)=63$

Combine the like terms:

$5x-12=63$

Add 12 to both sides of the equation:

$5x=63+12$

$5x=75$

Divide by 5:

$x=15$

Step 4: Calculate Sharad's present age
Since Sharad's present age is $3x$:

$3\times 15=45$ years

Therefore, Sharad's present age is 45 years.