The important part here is "daily" - so we can ask, what else happens daily? the seasons, which are caused by the tilt of the earth and the Earth's rotation around the Sun, are on a yearly schedule rather than a daily schedule. What happens on a daily basis is one rotation of the Earth on its axis - and the correct answer is a)
A is the correct answer.
A Democratic President is likely to appoint, well, Democrats!
A modern Republican held Senate might have problems with that.
So, what has been occurring is that nominations are slowed down or held up if there is a party difference between the Senate and the Presidency.
