An example of casework by a member of Congress based on the options given will be B. working with a caucus on a public policy that affects his or her constituents.
Casework simply means the assistance that's provided to constituents by the member of Congress who need help while filing a grievance that they've with the government.
An example of casework by a member of Congress is working with a caucus on a public policy that affects his or her constituents. This is important to the representational duties of the member of Congress.
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