The formation of the internal ear is a complex process that involves the development of a variety of structures in a specific order. The correct order of development, from earliest to form to latest, is otic placodes, otic pits, and otic vesicles. So the correct option is B.
Otic placodes first appear during the fourth week of embryonic development. These are small thickenings on the surface of the head that will eventually develop into the inner ear structures. During the fifth week of development, otic pits begin to form, which are small depressions in the otic placodes. These will eventually form the inner ear, including the semicircular canals, cochlea, and vestibule. Finally, during the sixth week of development, the otic vesicles form from the otic pits. These vesicles will become the cochlear duct, vestibular duct, and the utricle and saccule.
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