It is obvious that people hold different opinions about ____ voluntary services should be financially rewarded.

A．that

B．what

C．how

D．whether

公司一直都是按深圳最低工资标准来为员工购买住房公积金，其实我个人工资远远不止2000，不知如何处理？可以要求公司补缴吗？咨询电话多少？