who has trouble falling asleep, signed up for a research study testing a medication that is supposed to help with sleep

who has trouble falling asleep, signed up for a research study testing a medication that is supposed to help with sleep. Half of the research participants were given the study medication, and the other half were given a pill with no active ingredients. None of the participants knew what type of pill they received. If Albertha received the inactive pill, which outcome would be consistent with her experiencing the placebo effect?
a) Albertha would report that it is easier for her to fall asleep.
b) Albertha would report no change in her sleep habits.
c) Albertha would have increased difficulty falling asleep.
d) Albertha would build up tolerance to the active ingredients.