A Battery Has an Unloaded Terminal Voltage of 48 V $\varOmega$

A battery has an unloaded terminal voltage of 48 V.When a load of 15 $\varOmega$ is connected to the battery,the terminal voltage drops to 45.4 V.What is the internal resistance of the battery?

A) 1.0 $\varOmega$
B) 1.2 $\varOmega$
C) 1.3 $\varOmega$
D) 0.86 $\varOmega$
E) 0.95 $\varOmega$