Q 12 please answer as soon as possible

$$\begin{gathered} 12. Coefficient of x^{29} in the polynomial \\ \left(x -\frac{1}{1\times 3}\right) \left(x -\frac{2}{1\times 3\times 5}\right) \left(x -\frac{3}{1\times 3\times 5\times 7}\right) ........... \left(x -\frac{30}{1\times 3\times .... \times 61}\right) is \\ \left(A\right) \frac{1}{2}\left(1-\frac{1}{1\times 3\times .........\times 61}\right) \left(B\right) - \frac{1}{2} + \frac{1}{1\times 3\times ......\times 61} \\ \left(C\right) -\frac{1}{2}\left(1-\frac{1}{1\times 3\times .........\times 61}\right) \left(D\right) \frac{29}{1\times 3\times ........ \times 61} \end{gathered}$$