If A = A and B = D then what will be equivalent to C?

Question: If A = A and B = D then what will be equivalent to C?

Solution:
A = A(1 = 1)
B = D(2 = 4)
from the above relation, we get,
1² = 1
2² = 4

As C values 3 in the alphabet rank,
3² = 9
so, C = I