Ah, Keller's Personalized System of Instruction... the one where you have to wear a disguise and complete your lessons in a secret underground lab. Option D all the way!
Oof, this one's tricky. I'm gonna go with D, though. Keller's system is all about the individualized approach, right? Reading materials and self-paced learning, that's the way to go.
Woah, this question is right up my alley! I'm pretty sure the answer is D - that covers all the key features of Keller's Personalized System of Instruction.
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