\eqalign{ & {\text{If }}\frac{x}{{\left( {2x + y + z} \right)}} = \frac{y}{{\left( {x + 2y + z} \right)}} = \frac{z}{{\left( {x + y + 2z} \right)}} = a{\text{,}} \cr & {\text{then find }}a\,,{\text{ if }}x + y + z \ne 0 \cr} $$%!

• A. 1/3
• B. 1/4
• C. 1/2
• D. 1/8