Vidisha placed a copper wire in silver nitrate solution as shown in the figure. Which of the following represents the correct observation?

• A. The colour of the solution turned blue and precipitate of solid silver was obtained.
• B. Colour of solution turned green and copper wire turned blue.
• C. There was no change in the colour of solution or colour of the wire.
• D. Colour of the solution became silver and there was no change in the colour of copper wire.