A chemical compound always contains the same elements combined together in the same proportion or ratio is the statement of?

Correct Answer: C. Law of constant composition 

The statement “A chemical compound always contains the same elements combined together in the same proportion or ratio” is associated with the Law of constant composition. This law, also known as the Law of definite proportions, states that a given compound is always composed of the same elements in the same fixed ratio or proportion by mass. Regardless of the source or method of preparation, a pure compound will have a consistent composition.