Cho

Câu hỏi: Cho $\underset{x\to 1}{lim}\frac{f\left(x\right)-10}{x-1}=5$. Khi đó $\underset{x\to 1}{lim}\frac{f\left(x\right)-10}{\left(\sqrt{x}-1\right)\left(\sqrt{4f\left(x\right)+9}+3\right)}$bằng

A. 1

B. $\frac{5}{3}$

C. 2

D. 10