DNA is unzipped by helicase at the origin of replication. There are several origins of replications in eukaryotic DNA replication, while only one in prokaryotic replication.
I believe the answer would be C. Because all worms normally have round bodies, and yes, they can be slender. They also don't really have nostrils, they can breathe through their skin even though they don't have lungs. So C. would be the best answer.
The answer is A. Can mate with each other and produce fertile offspring.
