Age discrimination in employment is unrestrained, with arbitrary

Age discrimination in employment is unrestrained, with arbitrary retirement practices and ​（） against hiring older people for available jobs.
A、greetings
B、bias
C、inevitability
D、concessions
【正确答案】：B
【题目解析】：bias against：对……有偏见。句意：就业方面的年龄歧视是不受任何限制的，规定退休的具体做法很任意。在雇佣人时对上年纪的人有歧视。