The answer is (b) inattentional blindness. The main characteristic of inattentional blindness that sets it apart from other failures in awareness is the unanticipated nature of the unnoticed stimulus.
A person experiences inattentional blindness or inattentive blindness when they are unable to see an unexpected stimulus that is right in front of them, without any visual impairments or deficiencies.
A short "blindness" effect can happen when it becomes unable to pay attention to all the stimuli in a situation, preventing people from noticing unexpected but frequently salient items or stimuli.
It is connected to yet different from other visual awareness failures such change blindness, repetition blindness, and visual masking.
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