You must wait 2 years before you can lobby the Department of Energy on behalf of your new employer.
Answer: Option C
Step-by-step explanation:
Lobbying in U.S. implies approaching any federal or state legislator or any executive officer for pushing any enactment or bringing about changes in any enactment or policy or for extension of any financial assistance or contract, etc.
There are many regulations and statues which prohibit the employees of federal government to indulge in the activity of lobbying. A bar of 2 years is imposed on the employee of the company who was previously working as a policy analyst in the department of energy before he can lobby with the department on behalf of his new employer.