Concept:
Coelom formation occurs by two methods:
• Schizocoely \(\rightarrow\) Protostomes
• Enterocoely \(\rightarrow\) Deuterostomes
Step 1: Understand enterocoely.
In enterocoely, the coelom develops as outpocketings of the archenteron.
Step 2: Identify the animals.
Examples:
\[
\text{Echinodermata and Chordata}
\]
These belong to deuterostomes.
\[
\boxed{\text{Enterocoelomates = Deuterostomes}}
\]
Hence option (D) is correct.