The correct option is B Welcomed by some segments as evidence that the long-defunct film industry was about to witness a sudden productive surge, the new films became ammunition in the ideological wars of contemporary British culture.
The free-standing(absolute) part of the combined sentence describing the main subject and the verb is "These films...British culture." If a conjunction was to be added, it would become the subordinate clause. However, it being a nominative absolute, it appears at the end. Therefore Option C is correct. The rest of the options contain this as a subordinate clause, hence incorrect.