If x = a(b - c), y = b(c - a), z = c(a - b), then the value of $${\left( {\frac{x}{a}} \right)^3}$$+ $${\left( {\frac{y}{b}} \right)^3}$$+ $${\left( {\frac{z}{c}} \right)^3}$$is?

• A. $\frac{{xyz}}{{abc}}$$
• B. $\frac{{2xyz}}{{abc}}$$
• C. $\frac{{3xyz}}{{abc}}$$