Which of the following sequences is found in Rous sarcoma virus?

• A
  $DNA \rightarrow RNA \rightarrow \text{Protein}$
• B
  $RNA \rightarrow RNA \rightarrow \text{Protein}$
• C
  $RNA \rightarrow DNA \rightarrow RNA \rightarrow \text{Protein}$
• D
  $DNA \rightarrow DNA \rightarrow \text{Protein}$