For all $\mathrm{n} \in \mathrm{N}$, if $1^3+2^3+3^3+\ldots. .+\mathrm{n}^3>\mathrm{x}$, then a value of x among the following is

• Correct answer
  A

  $\frac{n^2}{4}$
• B

  $\mathrm{n}^2$
• C

  $\mathrm{n}^4$
• D

  $\frac{\mathrm{n}^2(\mathrm{n}+1)^2}{4}$

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