Even Though Political Appointees Are Allowed to Engage in Some

Even though political appointees are allowed to engage in some political activities, the Hatch Act still poses which one of the following difficulties for them?

A) It does not apply to their opponents in Congress.
B) Congress and the courts have never clarified exactly which activities are prohibited, so they have to use educated guesswork.
C) Presidents can put pressure on them to engage in political activities because of the Hatch Act exemption.
D) Their jobs often mix government service with political action, and it is difficult to keep them separate.