Sammy is required by her employer to work a standard eight-hour workday .Suppose her marginal rate of substitution of leisure  for income is less than the wage rate at this level of work effort .We can conclude that Sammy will :(   )
A feel underemployed
B probably have a higher than average absenteeism rate
c feel overemployed
d prefer to work part-time ,if such a job is available at the same wage rate
答案先A，麻烦强人翻译成中文，并解释一下答案