What Is the Magnitude of the Potential Difference Between Points $C$

Multiple Choice

What is the magnitude of the potential difference between points $C$ and $D$ for the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.

A) $6.0 \mathrm {~V}$
B) $4.0 \mathrm {~V}$
C) $3.0 \mathrm {~V}$
D) $2.0 \mathrm {~V}$