Which of the Following Is the Best Explanation for Why

Multiple Choice

Which of the following is the best explanation for why we need a generalized arousal response instead of only less energertically-costly, attention-focused responses?

A) we need the ability to respond to stimuli that we are unfamiliar or unprepared for
B) we are incapable of learning attention-focused responses quick enough
C) we are at the mercy of only one type of response to excitatory neurotransmitters
D) our ability to discriminate between distinct stimuli is not very evolved