If Each Interphase Nucleus in a Preparation of Normal Rat

Multiple Choice

If each interphase nucleus in a preparation of normal rat epithelial cells is found to contain a single Barr body,one can conclude that

A) the cells are in meiotic prophase.
B) all of the chromatin in these cells is inactive.
C) the DNA in these cells has replicated itself.
D) the cells are not transcribing any genes.
E) the cells came from a female rat.