Assertion $(A):$ The split gene arrangement represents probably an ancient feature of the genome.
Reason $(R):$ $\text{hnRNA}$ undergoes additional processing called as capping and tailing.
Choose the correct option.

• A
  $(A)$ and $(R)$ are correct,$(R)$ is correct explanation of $(A)$
• B
  $(A)$ and $(R)$ are correct,$(R)$ is not correct explanation of $(A)$
• C
  $(A)$ is incorrect,$(R)$ is correct
• D
  Both $(A)$ and $(R)$ are incorrect