The correct answer is option C, that is, it is reduced.
In reduction and oxidation reactions, reduction refers to the loss of an oxygen atom from a molecule or the gaining of one or more electrons. A reduction reaction is observed from the perspective of the molecule being reduced, as when one molecule gets reduced, another one gets oxidized. The complete reaction is called a redox reaction.
In the given case, iron gains electrons mean that it is reduced.
C because D stands for delta therefore it signifies change
Prokaryotes:
1). lack a well-defines nucleus.
2). cannot perform basic life functions.
Prokaryotes have cell organelles like the Endoplasmic Reticulum and Chlorophyll and prokaryotes are smaller than a eukaryote.
Hope this helps :)