Consider the expansion $\left(x^2+\frac{1}{x}\right)^{15}$. What is the sum of the coefficients of the middle terms in the given expansion?

• A

  $\mathrm{C}(15,9)$
• B

  $\mathrm{C}(16,9)$
• Correct answer
  C

  $\mathrm{C}(16,8)$
• D

  None of these

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