Find the tension on wire labeled (1) as shown in the figure. (You may use $g=10\frac{m}{s^2}$)

The alternatives given in my book are as follows:

$\begin{array}{ll}

1.&\frac{1}{2}mg\\

2.&mg\\

3.&\frac{3}{2}mg\\

4.&2mg\\

4.&\frac{5}{2}mg\\

\end{array}$

In this particular problem I'm lost at how should I proceed with the vectors. Can somebody help me on how is the interaction between the weight on the sphere which is labeled as 2m and the block which weight is $m$?.