Biology

The correct answer is D.Sister chromatids.

Explanation:

D.Sister chromatids: These are the two identical copies of a chromosome formed during DNA replication, which are connected by a centromere. When chromosomes replicate, they form an "X" shape, with each half of the "X" being a sister chromatid. The "X" structure with a centromere in the middle specifically refers to sister chromatids joined together.

A.Chromatin Sisters: This seems to be a confusion of terms. Chromatin refers to the uncondensed form of DNA, and "sisters" would likely be referring to sister chromatids, but this is not a...