The correct answer is A) in secret or illegally.
Sometimes people worry that the President will make decisions in secret or illegally.
This is true because the President of the United States is the most powerful man in the country and people fear that he might decide things in secret or illegally. This has happened in the past, as in the case of Rochard Nixon in the Watergate scandal that forced him to resign.
Let's have in mind that the President of the US is the Head of the State, the Commander.in-Chief of the Armed Forces, the chief diplomat. So as the head of the executive branch he has to set the example.