A Long Piece of Ribbon Wired Along Both Long Edges

A long piece of ribbon wired along both long edges is twisted into a helix and wrapped around individual pipe cleaners that have been rolled into spools;this grouping is then twisted (super coiled) again to condense it.This could be best used as a simple model for

A) a plasma membrane,where the pipe cleaners represent the phospholipid bilayer and the ribbon represents proteins embedded in the membrane.
B) a cell wall.
C) a mitochondrion.
D) a chromosome,where the pipe cleaners represent bundles of proteins around which the DNA double helix (wired ribbon) is wrapped.