Question

if a speaker says, \everyone is using this treatment, so it must work,\ that would be an example of — (1 point)
○ ad hominem
○ bandwagon
○ false cause
● appeal to authority

Explanation:

The Bandwagon fallacy occurs when someone argues that a claim is true or an action is good just because many people are doing it or believe it. In this case, the speaker claims the treatment works because "everyone is using it", which fits the Bandwagon fallacy. Ad Hominem attacks the person, False Cause misattributes causation, and Appeal to Authority relies on an expert's word—none match here.

Answer:

Bandwagon