Which One of the Following Statements About Work Measurement Is

Which one of the following statements about work measurement is TRUE?

A) Work sampling is a technique to determine the proportion of time spent on different activities.
B) In determining the normal time for the cycle,using a rating factor less than one (1.0) will increase the total time allowed for a job to be performed,relative to the select time.
C) Machine standards are more difficult to develop than labor standards.
D) The time study method is most appropriate for non-repetitive jobs in which the nature of the task differs each time.