The correct options are
B Nematoda and Coelenterata
D Annelida and Arthropoda
Platyhelminthes and Annelida have bilateral symmetry in which there is only one plane which divides the body into two equal halves.
Platyhelminthes and Annelida are triploblastic which means having a body derived from three embryonic cell layers (ectoderm, mesoderm, and endoderm).