Sand and gravel mixture would be easiest to separate based on the size of the particles.
<h3>What are mixtures?</h3>
Mixtures are the composition which can be obtained by the combination of different types of elements.
In the question different types of mixtures are given in which all have same kind of size distribution except sand and gravel. Size of sand is smaller than gravel, so it can be separated by easy physical method like sieving.
Hence, option (d) is correct it means sand and gravel would be easiest to separate.
To know more about mixtures, visit the below link:
brainly.com/question/1917079
