Chromatin is the combination of dna and rather than a condensed form of dna (to my knowledge).
In prophase, the chromatin condenses- becoming super-coiled and compact which is why it becomes visible. Before that (during) it is unravelled in the nucleus like a big squiggly mess (don’t write that in an exam please but its how i visualise it!).
The main differences between the two answers is that in D, the DNA strand doesn’t condense around R which makes sense to me if you visualise it.
Sorry if this is incorrect, its just how id think about it but im no expert (year 12 biology student).