How Many of the Pairs Listed Below Are Exact Duplicates

How many of the pairs listed below are exact duplicates?
A!@@$#a - a!@@$#a
B&*^&%b - b&*^&%b
G%%^*(g - g%+=*(g
X!$*%V:{+!&v - v:{+^&v

A) 1
B) 2
C) 3
D) 4
E) 5