If $\frac{x+1}{x^3(x-1)}=\frac{a}{x}+\frac{b}{x^2}+\frac{c}{x^3}+\frac{d}{x-1}$ then

• A

  $a=b=c=-d$
• Correct answer
  B

  $a=b=2 c=-d$
• C

  $a=2 b=c=-d$
• D

  $a=b=2 c=d$

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