In This Circuit, Two Batteries, One with a Potential Difference $\Omega$

Multiple Choice

In this circuit, two batteries, one with a potential difference of 10 V and the other with a potential difference of 20 V, are connected in series across a resistance of 90 $\Omega$ . The power delivered by the 10-V battery is approximately

A) 5.4 W
B) 15 W
C) 10 W
D) 3.3 W
E) 6.7 W