Which Best Describes the Relationship Between the Nucleobases in a Piece

Multiple Choice

Which best describes the relationship between the nucleobases in a piece of DNA?

A) They are parallel to the helical axis.
B) They are perpendicular to the helical axis.
C) They are randomly oriented with respect to the helical axis.
D) They are covalently bonded between the nucleobases across from one anothr in the two DNA strands
E) The four nucleobases are present in equal quanitites in a piece of DNA