The first one (facts and details)
The best option is D studied.
This word denotes a measured, even-handed approach to the issue. So, it should be :Current immigration policy must be studied before new proposals can be made.
In Sir Gawain and the Green Knight, the one who first accepts the Green Knight’s challenge was of course King Arthur. This was the case because he was the one who’s being mocked by the Knight. However, when Arthur gets the Knight’s axe, Sir Gawain said that he would take the challenge himself.
The anecdote that introduces this topic, is the beginning sentence.
"When adolescence hit Frances Jensen's sons, she often found herself wondering, like all parents of teenagers, "What were you thinking?"