Testing by Which Type of Psychologists Has Shown That Umpires

Testing by which type of psychologists has shown that umpires can call balls and strikes more accurately if they stand behind the outside corner of home plate with this position supplying better height and distance information and allowing umpires to see pitches pass in front of the batter?

A) sports psychologists
B) sensation and perception psychologists
C) environmental psychologists
D) human factors psychologists