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This question has Statement $- 1$ and Statement$- 2$. Of the four choices given after the statements, choose the one that best describes the two statements. 
Statement $- 1$ : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals.
Statement $- 2$ : The state of ionosphere varies from hour to hour, day to day and season to season.

• A
  Statement$-1$ is true, Statement$-2$ is true, Statement$-2$ is the correct explanation of Statement$-1.$
• ✓
  Statement$-1$ is true, Statement$-2$ is true, Statement$-2$ is not the correct explanation of Statement$-1.$
• C
  Statement$- 1$ is false, Statement$- 2$ is true.
• D
  Statement$- 1$ is true, Statement$- 2$ is false