After an Experiment Was in Progress, a Researcher Learned That

Multiple Choice

After an experiment was in progress, a researcher learned that the experimental group had a more experienced teacher than did the control group.Should the researcher mention this fact in the research report?

A) Yes, any factor which might affect the internal validity of the experiment should be reported.
B) No, it is not necessary for the reader to know all the details about problems which arise during the course of a study.