The problem with replicating the ends of linear DNA is due to which of the following?

A) That DNA polymerase does not require a pre-existing primer.
B) The removal of the primer from the 3' end of the new DNA strand.
C) The removal of the primer from the 5' end of the new DNA strand.
D) That the primer is composed of RNA rather than DNA.
E) That DNA polymerases can not synthesize DNA in the 5' to 3' direction.