78. Which of these statements about inhibitors is true? (A) DAPI (4',6-diamidino-2-phenylindole) can be used to stain both live and fixed cells for fluorescent microscopy because it binds strongly to A-T rich regions in DNA. (B) Actinomycin D is used for the study of protein stability because it inhibits translational elongation. (C) Cycloheximide is used for the study of protein stability because it inhibits transcriptional elongation. (D) Ethidium bromide is used to see protein gel bands because it is an intercalating agent for protein. (E) Colchicine is used to see chromosomes in mitotic prophase because it inhibits microtubule polymerization.