The Available Data from Patients with Brain Damage to Circuits

The available data from patients with brain damage to circuits controlling attention indicate that

A) the brain mechanisms controlling attention are inseparable from the brain mechanisms directly involved in perception.
B) multiple brain mechanisms are responsible for the control of attention.
C) a single mechanism governs the ability to disengage attention from its current focus and the ability to lock into a new attention focus.
D) the mechanisms controlling attention differ from one individual to the next.