I dunno. It's pretty close between A and D in my opinion, under the LFU analysis. B and C are obviously just wrong, going by the definition "Even a scallop should know better", unless one hypothesizes a typo substituting "-" for "X" in B.

Now I think C must actually be the answer, as it was obviously intended to wind up a trick or perhaps Zen-flavored question:

"How many roads must a person walk down, with three $60 bills in her pocket?"

"I have investigated that old woman! 60 + 4."

Striving to increase my rate of flow, and fight forum gloopiness. sick