If `C_(0), C_(1), C_(2),…, C_(n)` denote the binomial
coefficients in the expansion of `(1 + x)^(n) ,` then `sum_(r=0)^(n)sum_(s=0)^(n)(C_(r) +C_(s))`

Options

A. `2^(2n)`
B. `2^(n)`
C. `2n`
D. None of these

Answer

D