$DNA$ exists in a double-stranded form whereas $RNA$ is mainly a single-stranded molecule. What is the likely reason for $DNA$ being double-stranded?

• A
  $RNA$ strands cannot form base pairs.
• B
  Double-stranded $DNA$ is a more stable structure.
• C
  $DNA$ cannot exist in the single-stranded form.
• D
  It is easier to replicate double-stranded $DNA$ than single-stranded $RNA$.