Convert the following temperatures to the Celsius scale.
$(a)$ $293 \, K$
$(b)$ $470 \, K$

• A
  $200 \, ^\circ C$ and $190 \, ^\circ C$
• B
  $20 \, ^\circ C$ and $197 \, ^\circ C$
• C
  $15 \, ^\circ C$ and $200 \, ^\circ C$
• D
  $25 \, ^\circ C$ and $195 \, ^\circ C$