To minimize bias in assessing learner attainment of course objectives, a trainer must do which of the following?

A.
Measure each learner’s progress from the individual’s starting point.

B.
Measure each learner from a choice of standards based on individual learning styles.

C.
Measure all learners against the same pre-established standard.

D.
Measure all learners by using evaluation techniques that are unobtrusive.