If a strip of $\mathrm{Cu}$ is placed in a solution of ferrous sulphate, which one of the following alternatives is observed?

If a strip of $\mathrm{Cu}$ is placed in a solution of ferrous sulphate, there  is no reaction observed

No change will be seen if a piece of copper is dissolved in iron sulphate solution. This is because copper, which is less reactive than iron, cannot remove iron from a solution.

Hence option D is correct