C is the only right answer. Necks are wrung, not rung. Maybe people think that's correct because you can do a bell-ringing motion when you're throttling someone? Anyway, there's no such thing as a "beckon call"--which is it, the beckoning or the calling?--and "being at someone's beck and call" refers to being willing to respond to anything the dominant party commands the submissive party to do, be it by gestures or words. There is no loop to be thrown through, and there is no throwing during passion.