If $\frac{2 x^4-3 x^2+4}{\left(x^2+1\right)\left(x^2+2\right)}=a+\frac{p x+q}{x^2+1}+\frac{m x+n}{x^2+2}$, then $\frac{n}{q}=$

• Correct answer
  A

  $p+m-a$
• B

  $\frac{p+m}{a}$
• C

  $\frac{a}{p+m}$
• D

  $p+m+a$

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