Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$: If we move from poles to equator, the direction of acceleration due to gravity of earth always points towards the center of earth without any variation in its magnitude.

Reason $R $: At equator, the direction of acceleration due to the gravity is towards the center of earth. In the light of above statements, choose the correct answer from the options given below

• A

  Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.

• B

  Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$.

• C

  $A$ is true but $R$ is false

• D

  $A$ is false but $R$ is true