Biology question chromosomes

Hi, please could i have help on this question. I don’t understand why A is incorrect, I know the answer is d but is an incorrect because the chromatids dont have linear dna but it is coiled instead?
Here is the question: https://app.gemoo.com/share/image-annotation/630114727612502016?codeId=DWlz7OL2elleQ&origin=imageurlgenerator
Thanks!

Its interphase, not after semi conservative replication.
Before replication, 1 chromosome has 1 chromatid.
After replication, 1 chromosome is 2 chromatids joined at centromere.

Aren’t there always 2 chromatids in a chromosome?

No - you only think it is that way, because chromosomes become visible during mitosis.
Mitosis happens after semi-conservative replication.

Ohhh, so during interphase, is it visible as chromatin?

In interphase the chromosomes are unfolded, so a state in which they are not coiled. That is the phase in which chromatins are still in existence, but in the next one, the prophase, the chromatins start to get coiled by histons to chromatid first, then to a chromosome step by step. In short: yes, you would see it in interphase.

Ohh thanks