Metals of high purity are obtained by zone refining.
Impurities are more soluble in melt in pure metal.

Options

A. S-I and S-II are true and S-II explains S-I
B. S-I and S-II are true and S-II does not explains S-I
C. S-I is true S-II is false
D. S-I is false S-II is true

Answer

A