Concept: The question tests on the basics of Mensuration.
Solution:
A new og 2021 question
Volume of X (V)= ∏r^2 h where r is the radius of X and h is the height of X.
St(1):- The height of X is 20.
The statement does not provide us with any data on the value of "r" that is essential to calculate V. (Insufficient)
St(2):- The base of X has area 25π.
The statement does not provide us with any data on the value of "h" that is essential to calculate V. (Insufficient)
Combining both we have
h = 20 (from st(1) )
∏r^2 = 25 ∏
=> r = 5 units.
V = ∏r^2h and can be computed. (Sufficient) option(C)