Question

computer safety control settings are most often used to
protect children.
eliminate hacking attempts.
block harmful content.
cure viruses.

Explanation:

Computer safety control settings are mainly used to restrict access to inappropriate or harmful material. While they can contribute to protecting children, their broader - scope function is to block harmful content. They cannot completely eliminate hacking attempts or cure viruses which require specific security software and antivirus programs respectively.

Answer:

block harmful content.