【正确答案】 D

【答案解析】图像会在人看过后在视网膜上保留1/6秒．从文中这句话He studied the so-called“inertia of the eye”(视觉滞留)which makes a picture remain on the retina for about one-sixth of a second after it has disappeared from our vision．可以断定D)选项正确。