In a classic study on memory, the researcher showed people 2,560 photographs at a rate of one every ten seconds. Each person was then shown 280 pairs of photographs with each pair having an "old" picture (from the first set of photos) and a similar "new" image. The subjects could tell which photograph they had seen before in what percent of the paired photographs?
a. only 5 percent
b. 15 to 25 percent
c. 45 to 55 percent
d. 85 to 95 percent
D
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