Assertion $(A)$: Alkali metals are soft and have low melting and boiling points.
Reason $(R)$: This is because interatomic bonds are weak.

• A
  Both $(A)$ and $(R)$ are not true
• B
  $(A)$ is true but $(R)$ is not the correct explanation of $(A)$
• C
  $(A)$ is true but $(R)$ is false
• D
  Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$