The common ancestor of which clade evolved the derived trait?

The common ancestor of which clade evolved the derived trait?
A.
Ceolom developed by enterocoely
B.
Trochophore
C.
Bilateral symmetry
D.
multicellularity
E.
Coelom developed by schizocoely
Common ancestor of all animals
Bilateria
Protostomes
Dueterostomes
Lophotrochozoa
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