我觉得应选D
类似与well prepared（准备充分的）的用法.
相当于（who was）prepared for... 做好准备的,愿意的.
前边seated himself in a chair 表示已经坐定了,已经做好准备为大家解答问题了.选prepared更为贴切.而选C preparing 更强调还在准备中.
be prepared for形容已经做好准备了.
prepare for sth.为某事做准备.
不懂追问~
The professor walked onto the platform and seated himself in
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