【单选题】A good test for whether a term is an argument marker is to swap the position of the clauses on either side of the term and see if the sentence still means the same as the original sentence.
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.