Cause Advocacy is the correct answer.
Working on behalf of groups of people who lack the ability to defend or help themselves is: Cause Advocacy
Advocacy is standing up for a particular issue or cause that your supporters care deeply about. This type of advocacy is led by an organization, group of people, or individual with the aim of raising awareness of the problem and finding or promoting solutions.
An example of advocacy is when social workers work with organizations to change county or state policies or laws that limit their ability to provide needed services (such as family planning or contraceptive education).
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