Convert the following temperatures to the Celsius scale:
$a.$ $300 \, K$
$b.$ $573 \, K$

• A
  $27 \, ^\circ C$ and $300 \, ^\circ C$
• B
  $270 \, ^\circ C$ and $30 \, ^\circ C$
• C
  $25 \, ^\circ C$ and $330 \, ^\circ C$
• D
  $40 \, ^\circ C$ and $270 \, ^\circ C$