Steam distillation is used to

ANS:B - avoid thermal decomposition of a component.

Steam distillation is used to avoid thermal decomposition of a component. In steam distillation, steam is passed through a mixture containing the component to be distilled, typically at a temperature lower than the boiling point of the component. This method is particularly useful when the component is sensitive to high temperatures and may undergo thermal decomposition or degradation under normal distillation conditions. By using steam, the temperature required for the distillation can be reduced, minimizing the risk of thermal decomposition of the component. This allows for the isolation of heat-sensitive compounds, such as certain essential oils, fragrances, or organic compounds, without damaging their chemical integrity. So, the correct option is: avoid thermal decomposition of a component.