The correct option is
A 32 years
From the first statement, it is clear that Pawan's age is not 32 years and Mandar's age in not 35 years. From the second statement, it is clear that Shivku's age is 29 years and Pawan's age is not 21 years.
Thus from these two statements, we get Pawan's age is 35 years.
Now from the third statement, Mandar's age is not 32 years.
Thus, Mandar's age is 21 years. Hence, we get Chandra's age as 32 years.