Which of the following clades contain only ""invertebrate"" (""nonvertebrate"") taxa? In other words: which of the following deuterostome clades contain no ""vertebrate"" members?
A. Vertebrata
B. Olfactores
C. Ambulacraria
D. Urochordata
E. Chordata
F. Cephalochordata
G. Deuterostomia