A person that works for the interest group by speaking to members of Congress is known as a lobbyist.
Who is a lobbyist?
A “lobbyist” is a person who is paid for economic consideration to lobby on behalf of another person, or a person who is largely hired for governmental affairs by another person or governmental body to lobby on their behalf.
Lobbying is basically the process of persuading people or governments to take action or support a cause. He is the person that works for an interest group by speaking to members of Congress.
Therefore, option A is correct.
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