​Cynthia Has Contracted a Rare Virus While Traveling

​Cynthia has contracted a rare virus while traveling. Her doctor prescribes a new antiviral drug whose efficacy is unproven as yet, but seems quite promising in early trials. Cynthia has an excellent response to the drug. What is likely in this case?

A) ​Cynthia's response is more likely due to the placebo effect than the treatment.
B) ​Cynthia's response is more likely due to the treatment than the placebo effect.
C) ​Cynthia's response is most likely due to the treatment plus the placebo effect.
D) ​Cynthia's response is most likely due to neither treatment nor placebo effect.