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.

B

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.