Cilia Differ from Flagella in That

Cilia differ from flagella in that

A) the protein filaments of cilia are "naked," while those of flagella are wrapped in an extension of the cell membrane.
B) cilia are typically more numerous and shorter than flagella.
C) cilia are anchored only in the proteins of the cell membrane,while flagella are anchored in a special structure called the basal body.
D) cilia contain nine microtubule doublets surrounding a central pair of microtubules,while flagella contain only nine microtubule doublets.