If $\mathop {\lim }\limits_{x \to 0} \phi (x) = {a^3}, (a \ne 0)$; then $\mathop {\lim }\limits_{x \to 0} \phi \left( {\frac{x}{a}} \right)$ is equal to :-
- A$\frac{1}{a^3}$
- B$a^3$
- C$a^2$
- D$\frac{1}{a^2}$
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