A copper wire with a radius of $2.0\mathrm{ mm}$ and a length of $0.80\mathrm{ m}$ is connected across the terminals of a $9.0\mathrm{V}$ battery. How much current flows in the wire?

• A. $1.5\text{kA}$
• B. $2.1\text{kA}$
• C. $2.7\text{kA}$
• D. $5.2\text{kA}$
• E. $12\text{kA}$
• F. $8.3\text{kA}$