Which of the Following Best Describes the Organization of the Attention

Which of the following best describes the organization of the attention in the brain?

A) Attentional mechanisms are probably implemented through mechanisms in the prefrontal cortex, but influences activity in many other areas.
B) Attentional mechanisms are implemented primarily through the reticular activating formation and do not involve the prefrontal cortex.
C) Attention is very disperse and modulated by most parts of the brain, including the brain stem and cortex.
D) The mechanisms of attention remain unknown, due to the limitations of understanding consciousness.