A.a^(2 * n+1)/(b^(2 * n-1)*c)^4
B.(a^(2 * n+1)/(b^((2*n-1)*c)))^4
C.(a^(2 * n+1)/(b^(2 * n-1)*c))^4
D.a^((2 * n+1)/b^((2 * n-1) * c))^4