\(\mathop {\lim }\limits_{x \to  - \infty } \frac{...

Câu hỏi: \(\mathop {\lim }\limits_{x \to  - \infty } \frac{{\sqrt {{x^2} - x}  - \sqrt {4{x^2} + 1} }}{{2x + 3}}\) bằng 

A. \(\frac{1}{2}\)

B. \(-\frac{1}{2}\)

C. \( - \infty \)

D. \( +\infty \)