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• A. $\displaystyle \lim _ {x \rightarrow 1+} {\frac{\sqrt x-1} {2x+1}}$ B. $\displaystyle \lim _ {x \rightarrow 0} {\frac{\sin x} {x}}$
• C. $\displaystyle \lim _ {x \rightarrow 0} {\frac{x} {\left | x \right |}}$ D. $\displaystyle \lim _ {x \rightarrow 2+} {\frac{\left (x^2 +1 \right) [x]} {\left (3x-1 \right) ^2}}$