If $\mathrm{A}(2,1,-1), \mathrm{B}(6,-3,2), \mathrm{C}(-3,12,4)$ are the vertices of a triangle ABC and the equation of the plane containing the triangle ABC is $53 x+b y+c z+d=0$, then $\frac{d}{b+c}=$

• A

  $-5$
• B

  $1$
• C

  $4$
• Correct answer
  D

  $-15$

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