Card 3 / 54: In an experiment aimed to study short-term memory, subjects were asked to remember three-letter consonant trigrams (LCK) during retention intervals, during which they counted aloud, ranging from 0 to 18 seconds. On average, recall for the trigrams was virtually absent after 18 seconds. Subsequent studies revealed that the poor memory at 18 seconds was primarily due to
A) Limited capacity of short-term memory
B) Serial position effect
C) Retroactive interference in long-term memory
D) Proactive interference in long-term memory

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