For each $t \in R$ let $[t]$ be the greatest integer less than or equal to $t$. Then <br> $ \displaystyle\lim_{x \to 0^-} x$ $\begin{pmatrix} [\frac{1}{x} +[\frac{2}{x}] +....+[\frac{15}{x}] \end{pmatrix}$

Question

( A ) does not exist (in R)
( B ) is equal to 15
( C ) is equal to 0
( D ) is equal to 120