Definitely D. Anything less would be like trying to catch a greased pig while juggling chainsaws. Not the best demonstration of experimental control, if you ask me.
D all the way! If the behavior matches the criterion, that's the holy grail of experimental control. Unless, of course, the criterion level is set to 'nap time' - then I might have to rethink my answer.
D sounds like the correct answer to me. If the behavior changes concurrently with the criterion level, that's the best demonstration of experimental control.
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