Final answer:
Hard water can lead to difficulty in blood drainage during the embalming process due to its high mineral content affecting the effectiveness of embalming chemicals.
Step-by-step explanation:
The complication that hard water may present in the embalming process is b) Difficulty in blood drainage. Hard water contains high levels of minerals such as calcium and magnesium, which can affect the effectiveness of embalming chemicals. These minerals can lead to the formation of blood clots or increased viscosity of the blood, making it more difficult for the blood to drain properly during embalming. Therefore, embalmers may need to take additional steps to address this issue, such as using special chemicals to counteract the effects of hard water or ensuring that the water used in the process is softened beforehand.