Biology

The correct answer is: D.sister chromatids.

Explanation:

During cell division, specifically in mitosis (and also meiosis), each chromosome is replicated to form two identical copies. These two identical copies are called sister chromatids. They are connected by a region called the centromere and will eventually be separated during anaphase of mitosis (or anaphase II of meiosis) to ensure that each daughter cell receives one copy of each chromosome.

Why the other options are incorrect: