Answer:
The correct answer is b. organ transplantation between species.
Evolutionary relationships between two species tell us about how close these species are, their common ancestors, similarity in DNA sequences, conserve sequences etc. Hence, one must have the knowledge about evolutionary relationships when considering the organ transplantation between two species.
On the other hand, for illustration of plant leaf, one must have the knowledge of plants anatomy instead of evolutionary relationships.
Similarly, blood donation within the same species demands the knowledge about blood groups or cell biology rather than evolutionary relationships.
Lastly, for studying DNA sequence of an insect may require the knowledge about genetics, bioinformatics etc.
