Cho 

Câu hỏi: Cho $\frac{a}{b}=\frac{b}{c}=\frac{c}{d}$. Chọn câu đúng

A. ${\left(\frac{a+b+c}{b+c+d}\right)}^3=\frac{a}{b}$

B. ${\left(\frac{a+b+c}{b+c+d}\right)}^3=\frac{a}{d}$

C. ${\left(\frac{a+b+c}{b+c+d}\right)}^3=\frac{b}{d}$

D. ${\left(\frac{a+b+c}{b+c+d}\right)}^3=\frac{a}{c}$