Detecting One Set of Letters (B,C,F,G,H,J,K,L)in the Presence of Another

Multiple Choice

Detecting one set of letters (B,C,F,G,H,J,K,L) in the presence of another set of letters (Q,R,S,T,V,W,X,Y,Z) :

A) is as hard as detecting letters in the presence of numbers.
B) is not affected by the number of letters in the display.
C) is more accurate but takes less time compared with detecting letters in the presence of numbers.
D) becomes automatic with enough practice.