MsCasella Has Scheduled Three Days for Students' Persuasive Speeches in Her

Ms.Casella has scheduled three days for students' persuasive speeches in her high school class.Which of the following practices is most likely to improve reliability in evaluating her students' oral presentations?

A) Rate the presentations on a 100-point scale to allow a wide range of scores.
B) Focus raters' attention on a few dimensions of the presentation.
C) Increase variability of scoring by incorporating many criteria for the presentations.
D) Invite colleagues to rate the presentations and use a different rater each day.