Identify the wrong sequence of the elements in a group

Q. Identify the wrong sequence of the elements in a group
A. Ca, Br, Ba
B. Cu, Au, Ag
C. N,P, As
D. Cl, Br, I
Answer: Cu, Au, Ag

A. Ca, Br, Ba
B. Cu, Au, Ag
C. N,P, As
D. Cl, Br, I
Answer: Cu, Au, Ag