If $x$ is positive real number and the first negative term in the expansion of $(1+\mathrm{x})^{27 / 5}$ is $\mathrm{t}_{\mathrm{k}}$ then $\mathrm{k}=$

• A

  $5$
• B

  $6$
• C

  $7$
• Correct answer
  D

  $8$

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