For distinct natural numbers $a$, $b$, and $c$,
$$\frac { 6 ^ { a } \cdot 15 ^ { b } } { 9 ^ { b } \cdot 10 ^ { c } }$$
is equal to an integer.
Accordingly, which of the following orderings is correct?\\
A) $a < b < c$\\
B) $b < a < c$\\
C) $b < c < a$\\
D) $c < a < b$\\
E) $c < b < a$