Mark against the correct answer in each of the following:
Question:

Mark $(\sqrt{ })$ against the correct answer in each of the following:

$\int\left\{(2 x+1) \sqrt{x^{2}+x+1}\right\} d x=?$

A. $\frac{3}{2}\left(x^{2}+x+1\right)^{3 / 2}+C$

B. $\frac{2}{3}\left(x^{2}+x+1\right)^{3 / 2}+C$

C. $\frac{3}{2}(2 x+1)^{3 / 2}+C$

D. none of these

Solution:

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