You will be given a definition of a task first, then some input of the task.
In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

What would a fly find most compelling? (A) a science fiction movie starring the actor Jeff Goldblum (B) a toilet seat scrubbed with baking soda and vinegar (C) a saline solution for contact lenses (D) a steak forgotten on a counter for an entire day
Output:
D