Answer:
D
Explanation:
A. Is wrong
Salt water is not an element. In fact it contains sodium and chlorine asides the elements of the water
B is wrong
It is a mixture but it is not heterogeneous. It is not heterogeneous in the sense that when you take a sample of salt, the composition is throughout the same I.e containing salt and water
C is incorrect
It is a mixture of salt and water. They are both compounds and hence they both exist together as a mixture
D is correct
It is correct because, a sample of salt water irrespective of the amount taken for observation would contain salt and water
