Which of the following statements best describes the difference between protostomes and deuterostomes in embryonic development?

• A. Protostomes have radial cleavage, whereas deuterostomes have spiral cleavage.
• B. Protostomes develop the mouth first from the blastopore, while deuterostomes develop the anus first.
• C. In protostomes, the coelom forms by enterocoely, while in deuterostomes, it forms by schizocoely.
• D. Protostomes exhibit indeterminate cleavage, whereas deuterostomes exhibit determinate cleavage.

Answer: (B)