Animal phylogenies based on molecular and morphological characters can be different in regards to the placement of the phylum Platyhelminthes. What is the best explanation for this?

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The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom.

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Some Platyhelminthes have a coelom, but others do not and it is difficult to conclude anything about its evolution within the clade.

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Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution.

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Platyhelminthes originated from ancestors with a coelom and have retained it to the present time.

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Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one.

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Animal phylogenies based on molecular and morphological characters can be differ...

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