The age of Harshad is four times the age of his son Vijay. Four years back, the age of Sudha was six times the age of her son Vijay. What is the current age of Sudha?Which of the below information is additionally required to answer the above question?

• A. After four years, the difference in the ages of Harshad and Sudha will be four years.
• B. The sum of ages of Harshad and Sudha after four years will be 8 more than the sum of their current ages.
• C. The sum of ages of Harshad, Vijay and Sudha before four years was 12 less than the sum of their current ages.
• D. The average age of Harshad, Vijay and Sudha is an even number.