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 potential difference across the 4- $\Omega$ resistor is:

A) 4.0 V
B) 8.0 V
C) 14 V
D) 16 V
E) 29 V