\(\dfrac{200^{200}\cdot 40^{40}}{20^{20}\cdot400^{400}}=\)
A. \(\dfrac{1}{2^{920}\cdot 5^{380}}\)
B. \(\dfrac{1}{2^{240}\cdot 5^{240}}\)
C. \(\dfrac{1}{2^{180}\cdot 5^{180}}\)
D. \(1\)
E. \(2^{180}\cdot 5^{180}\)
Answer: A
Source: Manhattan GMAT