Select the strongest oxidant and reductant given that all of the following processes are extensive.

Select the strongest oxidant and reductant given that all of the following processes are extensive.
Hint: This is a logic problem. If you know A reduces B2+, then you know A is a stronger reducing agent than B, so A > B. Look at each reaction and relate the two components. Soon you will have all 4 relationships: X > Z > W > Y.

Extensive Processes: A + B^2+ -> A^2+ + B
B + C^2+ -> B^2+ + C
D + B^2+-> D^2+ + B
A + D^2+-> A^2+ + D

A + B^2+ -> A^2+ + B A>B as far as reducing agent B+2 > A+2 as far as oxidiaing agent
I'll ignore the second realationship for now.
B + C^2+ -> B^2+ + C B>C
D + B^2+-> D^2+ + B D>B
A + D^2+-> A^2+ + D A>D

A>D>B>C

A is the strongest reducing agent
C+2 is the greatest oxidizing agent