Scorpions, silverfish and cockroach belong to same phylum arthropoda but Nereis is an annelids. So the option C is wrong.
All insects of phylum arthropoda have jointed appendages but Nereis don't have so the option D is wrong.
All these invertebrates possess a dorsal heart in their body, it is a long elongated tube situated in the mid dorsal line of the thorax.
So the correct answer is A.