If a normal is drawn at a variable point $\mathrm{P}(x, y)$ on the curve $9 x^2+16 y^2-144=0$, then the maximum distance from the centre of the curve to the normal is

• Correct answer
  A

  $1$
• B

  $7$
• C

  $12$
• D

  $\frac{3}{4}$

Hence, the correct answer is option: 'A'.