— Bill is ill. Do you know what's wrong with lum?            

—Poor boy. His illness is the_________of eating unhealthy food.     [ ]

A. result

B. cause

C. reason

D. end

职业资格证书是反映劳动者专业知识和职业技能水平的证明，是劳动者通过职业技能鉴定进入就业岗位的凭证。