Question

the structures labeled b are chromopheres chromatids centrioles centromeres

Explanation:

In cell biology, replicated chromosomes consist of two identical parts called chromatids. They are held together at the centromere. Chromospheres are not a standard term for the structures shown. Centrioles are involved in cell - division spindle formation and are not these structures. The structures labeled B are the two parts of a replicated chromosome, which are chromatids.

Answer:

B. chromatids