Answer: Option (B) is correct.
Step-by-step explanation:
Given that,
Price of silver increased from $30 per ounce to $31 per ounce.
At that time, overall price level increased by 5%
Therefore,
Change in price of silver = $31 - $30
= $1 per ounce
Percentage change in price of silver =

= 3.33%
Overall price level increases by 5% but the price of silver increases by 3.33%, which is less than 5%.
Hence, real price of silver decreases.