See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ? <br>

Question

( A ) $\epsilon_{1}-(i_{1}+i_{2})R-i_{1}r_{1}=0$
( B ) $-\epsilon_{2}-(i_{1}+i_{2})R+i_{2}r_{2}=0$
( C ) $\epsilon_{1}-(i_{1}+i_{2})R+i_{1}r_{1}=0$
( D ) $\epsilon_{2}-i_{1}r_{2}-\epsilon_{1}-i_{1}r_{1}=0$