A Researcher Is Conducting a Study to Discover Whether the Provision

A researcher is conducting a study to discover whether the provision of hypnosis with dental work affects pain. The researcher's three groups are (1) hypnosis before and during the procedure, (2) hypnosis before but not during the procedure, and (3) no hypnosis. If the researcher plans to use an ANOVA for the statistical analysis, which would be an acceptable way to measure pain, for this study?

A) Present versus absent
B) Worse ... Some ... A Lot ... Unbearable
C) 0- to 100-point verbal numerical scale
D) Systolic blood pressure readings
E) The force with which the subject squeezes a rubber ball with pressure gauge attached