If $V = 40 \mathrm {~V}$ And the Battery Is Ideal, What Is the Potential Difference

Multiple Choice

If $V = 40 \mathrm {~V}$ and the battery is ideal, what is the potential difference across $R _ { 1 }$ in the figure?

A) $8.0 \mathrm {~V}$
B) $6.7 \mathrm {~V}$
C) $20 \mathrm {~V}$
D) $10 \mathrm {~V}$