mc...

The answer is B.

ii is correct. A more reactive metal (X) can displace a less reactive (copper) from the solution of a copper salt (copper(II) sulphate). A more reactive metal is a stronger reducing agent. Therefore, X is a strong reducing agent than copper.

i is correct. The strong the reducing agent is a metal, the weaker the oxidizing agent is its cation. Since X is a stronger reducing agent than copper, the cation of X is a weaker oxidizing agent than copper(II) ion.

iii is incorrect. Since X is an unknown metal, the colour of cation of X is unknown. Furthermore, the reddish brown brown solid in the question is copper metal, and such colour gives no information about the colour of the cation of X.