In recent years there has been a ( ) for a rise in miners'wag

In recent years there has been a ( ) for a rise in miners'wage.
A、exsitent
B、constant
C、resistant
D、assistant
【正确答案】：B
【题目解析】：考核单词含义，existent 存在的，constant 连续的， resistent 抵抗的， assistant 辅助的，句子含义是近些年，矿工们要求涨工资。