What conclusion can be made if two or more organisms look similar during development? A. They share a common ancestor from long ago.
B. They have evolved from each other over time.
C. The traits are just a random occurrence.
D. The organisms evolved at the same time.

there are no details given

explanation:

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organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

i think the answer would d