Look at these Numbers.

$1^{20}, 2^7, 5^3$

In which set are the numbers ordered from greatest to least?
A. $5^3, 2^7, 1^{20}$
B. $1^{20}, 5^3, 2^7$
C. $2^7,1^{20}, 5^3$
D. $2^7, 5^3,1^{20}$