Two Identical Lightbulbs of Resistance 10 $\Omega$ Are Placed in the Circuit Shown Here

Multiple Choice

Two identical lightbulbs of resistance 10.0 $\Omega$ are placed in the circuit shown here. Both batteries are 6.0-V batteries. The current in the circuit is

A) 0 A.
B) 0.30 A.
C) 0.60 A.
D) 1.2 A.
E) 2.4 A.