The correct answer is D. Graduated time rate.
A graduated time rate is a method of wage payment in which the rate of pay increases with the length of service. This method is designed to reward employees for their loyalty and experience.
A flat time rate is a method of wage payment in which all employees are paid the same rate, regardless of their length of service or experience. This method is simple to administer, but it does not reward employees for their loyalty or experience.
A high day rate is a method of wage payment in which employees are paid a higher rate for working on days that are considered to be inconvenient or undesirable, such as weekends or holidays. This method is designed to attract and retain employees who are willing to work on these days.
A measured day rate is a method of wage payment in which employees are paid a rate that is based on the number of hours they work. This method is designed to encourage employees to work efficiently and to avoid overtime.
In conclusion, the correct answer is D. Graduated time rate. This method is designed to reward employees for their loyalty and experience.