Identify $A, B$ and $C$ in the given diagram:

• A
  $A \rightarrow$ Histone-$H_1$,$B \rightarrow$ $DNA$,$C \rightarrow$ Histone octamer
• B
  $A \rightarrow$ $DNA$,$B \rightarrow$ Histone octamer,$C \rightarrow$ Histone-$H_1$
• C
  $A \rightarrow$ Histone octamer,$B \rightarrow$ Histone-$H_1$,$C \rightarrow$ $DNA$
• D
  $A \rightarrow$ Histone octamer,$B \rightarrow$ $DNA$,$C \rightarrow$ Histone-$H_1$