Which statement is true regarding the behavior of ammonia and oil?

The statement that all the options provided are true is based on the principles of density and solubility of the substances in question.

Ammonia, being a lighter and less dense chemical compared to oil, does not mix well with oil and will indeed float on top. This is due to the immiscibility of ammonia in oil, which arises from differences in polarity; ammonia is polar while oil is non-polar.

Looking at carbon dioxide, it is non-polar and does not mix with oil due to similar immiscibility properties, leading it to also float on top of oil.

With respect to sulfur dioxide, it is more soluble in oil than some other substances, but in certain conditions, it may be less dense so it could potentially float on oil, particularly if the oil is sufficiently dense or if foam is created.

Understanding the interactions between these chemical substances is crucial in many practical applications, including safety protocols in firefighting and environmental considerations. Therefore, the conclusion that all statements accurately reflect the relationships of these substances regarding their behavior with one another is sound within these contexts.