The Protostome Developmental Sequence Arose Just Once in Evolutionary History

The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups-Lophotrochozoa and Ecdysozoa. What does this finding suggest?

A) These two subgroups have a common ancestor that exhibited deuterostome development.
B) Division of these two groups occurred before the protostome developmental sequence.
C) Division of these two groups occurred after the protostome developmental sequence appeared.
D) The lophotrochozoans are monophyletic.

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