Given below are two statements :
Statement $I :$ Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper.
Statement $II :$ It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method.
Choose the most appropriate answer from the options given below :

• A
  Statement $I$ is true but Statement $II$ is false.
• B
  Both Statement $I$ and Statement $II$ are true.
• C
  Statement $I$ is false but Statement $II$ is true.
• D
  Both Statement $I$ and Statement $II$ are false.