Answer:
A: ,
Use the semicolon if you have two independent clauses connected without a conjunction. Example: I have painted the house; I still need to sand the floors. Rule: Also use the semicolon when you already have commas within a sentence for smaller separations, and you need the semicolon to show bigger separations.
Answer:
The mentally ill were sometimes experimented on with treatments that sometimes caused more harm than good.
Explanation:
This passages points out both the good intentions and the harmful consequences of trying out new treatments on human subjects in the asylums.
It states that the institutions wanted to offer new and effective treatments to the patients, but that these were rudimentary and poorly understood and developed. This lack of refinement led to worse conditions for many of the mentally ill.
C. appearing on television
It is an appeal to Ethos as it comes from a point of authority of knowledge on a subject.