Magnetic Electricity (Potential Difference 2)

07

If R_1=3 , R_2=R_5=2 , R_3=1 , R_4=4 and , \varepsilon_1=24 V, \varepsilon_2=12 V. What is the potential difference between point A and point B (V_A - V_B )
a. -6 V
b. -12 V
c. -18 V
d. 12 V
e. 6 V