The percentage of $(G + C)$ in a $DNA$ molecule is given by:

• A
  $\frac{G + C}{A + G + T + C} \times 100$
• B
  $\frac{100}{A + T} \times (G + C)$
• C
  $\frac{G + C}{A + G + T + C}$
• D
  $\frac{(G + C) \times (A + T)}{100}$