Knowing that $0.333 \ldots=\frac{1}{3}$, what is the irreducible fraction equivalent to $0.1333 \ldots$.
(a) $\frac{1}{13}$
(b) $\frac{1}{15}$
(c) $\frac{1}{30}$
(d) $\frac{2}{15}$
(e) $\frac{1333}{10000}$