The correct option is A Arachnida- Ticks, mites
The scaly ant eaters belongs to the group of Eutheria. This group involves the Pangolins which have scales on their skin and feed on ants and termites.
Green algae belongs to Kingdom Plantae. They are included as eukaryotic organisms. They have well developed cell organelles like mitochondria and chloroplast.
Ascaris is Nematode while Taenia is a genus of tapeworm which is a type of helminth and belongs to Platyhelminthes. These are also called as flat worms. Annelida is the group of segmented worms like earthworm.
Ticks and mites fall in the order Arachnida. They have segmented body many pair of legs. They have regions like the cephalothorax and the abdomen.
Therefore, the correct answer is option A.