Final answer:
The mass of the stone in kilograms is 0.150 kg.
Step-by-step explanation:
To find the mass of the stone in kilograms, we need to convert the mass from grams to kilograms. There are 1000 grams in 1 kilogram, so the mass of the stone in kilograms is 150 grams / 1000 = 0.150 kg. Therefore, the correct answer is option B.