(Scenario II) by Randomly Assigning Participants to the Heavy Backpack

Multiple Choice

(Scenario II) By randomly assigning participants to the heavy backpack condition or light backpack condition, the experimenters have:

A) reduced the likelihood that the participants will stay blinded to the research hypothesis.
B) minimized the influence of factors other than weight on their snack preference.
C) increased the external validity of the study.
D) ensured that weight alone caused the participants' snack preference.