Answer:
B) Cytosine pairs with guanine in both.
Explanation:
DNA replication is the process by which DNA makes an identical  copy of itself during cell division. In this process the DNA polymerase adds a new strand of DNA to the template strand by matching Cytosines with Guanines and Adenines with Thymines.
In transcription  a copy of a specific DNA fragment is made,  however, this copy has  Adenines paired with Uracils instead Adenines  with Thymines.
In both, replication and transcription Cytosine pairs with guanine.
