1. The correct answer is: B

A therapist will carefully "watch" your condition throughout the procedure.

2. The correct answer is: D

Any of these alternatives would be understandable to prospective participants.

3. The correct answer is: C

Participants using the memory aids will be selected "by chance."

4. The correct answer is: D

This research will measure the "effectiveness" of an experimental treatment.

5. The correct answer is: D

"Protocol" is not a widely used term, but any of these alternatives would be meaningful.