Why Might What Doctors Call Attention Deficit Disorder (ADD) Have

Why might what doctors call Attention Deficit Disorder (ADD) have been naturally selected for to some degree?

A) Without anyone impulsive or fearless enough to grab the unlit end of a burning stick we might not have gained control of fire
B) ADD provides no advantages
C) Groups learn from information produced when risks prove too high
D) All the advantages listed are possible
E) Without anyone impulsive or fearless enough to jump on a floating log, rafting may not have been discovered