All would seem appropriate, but I'd say D, since it assists you in gathering data to support your clause
During he Pilgrim's Progress, both Christian and his companion are
detained as they pass through Vanity Fair, because of their open disdain about the contents of the area.
A. Both vertical and horizontal relationships represent equal status
A subordinate clause, dependent clause or embedded clause is a clause that is embedded within a complex sentence. For instance, in the English sentence "I know that Bette is a dolphin", the clause "that Bette is a dolphin" occurs as the complement of the verb "know" rather than as a freestanding sentence.
