Two Identical Batteries, Each with an Emf of 18 V $\Omega$

Multiple Choice

Two identical batteries, each with an emf of 18 V and an internal resistance of 1 $\Omega$ , are wired in parallel by connecting their positive terminals together and connecting their negative terminals together.The combination is then wired across a 4- $\Omega$ resistor.The current in the 4- $\Omega$ resistor is:

A) 2.0 A
B) 3.6 A
C) 4.0 A
D) 7.2 A
E) 9.0 A