Assertion $A$: Many new and improved varieties of fruits,vegetables,and flowers can be obtained through research in botanical gardens.
Reason $R$: Processes like grafting,tissue culture,hybridization,cloning,and the development of germplasm banks are carried out in botanical gardens.
Which option is correct for Assertion $A$ and Reason $R$?

• A
  $A$ and $R$ are both true and $R$ is the correct explanation of $A$.
• B
  $A$ and $R$ are both true but $R$ is not the correct explanation of $A$.
• C
  $A$ is true and $R$ is false.
• D
  $A$ and $R$ are both false.