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An exhausted airport security screener may notice the faintest indications of suspicious items in a suitcase, whereas more obvious but less relevant stimuli (like the color of the shirt of a passenger) fail to catch his attention.

Which theory BEST accounts for this situation?

A

Signal detection theory.

B

The Young-Helmholtz theory.

C

Place theory.

D

Frequency theory.

E

Opponent-process theory.

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