An electric heater of resistance $6 \, \Omega$ is run for $10 \, \text{minutes}$ on a $120 \, \text{V}$ line. The energy liberated in this period of time is:

• A
  $7.2 \times 10^3 \, \text{J}$
• B
  $14.4 \times 10^5 \, \text{J}$
• C
  $43.2 \times 10^4 \, \text{J}$
• D
  $28.8 \times 10^4 \, \text{J}$