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Statement $I:$ When a light ray from rarer medium is refracted into denser medium its velocity decreases and wavelength decreases.
Statement $II:$ Refractive index decreases with increases in temperature.

• A
  Both Statements are true. Statement$-II$ is the correct explanation of Statement$-I.$
• ✓
  Both Statements are true. Statement$-II$ is not correct explanation of Statement$-I$.
• C
  Statement$-I$ is true, Statement$-II$ is false.
• D
  Statement$-I$ is false. Statement$-II$ is true.