Electric circuits — practice question

The diagram illustrates a simple electrical circuit. Which statement cannot be true?

• AThe current $I$ is $2\,\text{A}$.
• BThe e.m.f. $E$ is $12\,\text{J}$.
• CThe p.d. $V$ (across the resistor) is $10\,\text{V}$.
• DThe resistance $R$ is $5\,\Omega$.