In order to find the product, we first multiply 8 by 25.
We have, 25 × 8 = 200
Now, 0.25 has 2 decimal places and 0.8 has 1 decimal place.
The sum of the decimal places is 2 + 1 = 3.
So, the product must contain 3 places of decimals.
∴ 0.25 × 0.8 = 0.200 = 0.2
Hence, the correct answer is option (b).