Garstang's Theory States That the Vertebrates Originated From

Garstang's theory states that the vertebrates originated from:

A) larval tunicates that developed the ability to reproduce sexually while retaining the larval body form
B) a gradual modification of the adult body form of Urochordates
C) larval Cephalochordates that developed the ability to reproduce sexually while retaining the larval body form
D) echinoderms with a post anal tail and notochord
E) segmented echinoderms