Which statement is not true regarding theropods?
a) some theropods evolved to lose their teeth, suggesting the possibility of a diet that included plants.
b) cranial crests and colorful plumage may have played a role in theropod sexual selection.
c) fossil evidence suggests some theropods may have engaged in social behaviors such as pack hunting.
d) theropod balance was aided by the near vertical position of the vertebral column.

D) Theropod balance was aided by the near vertical position of the vertebral column.  

Explanation:

Option A). is TRUE. Theropods were primarily carnivorous but later turned into into herbivorous. Therizinosaurs were the first confirmed non carnivorous theropods' fossils that were found. They are also known as segnosaurs.

Option B). is TRUE. The beautiful colorful plumage played an important role in the selection for a partner for mating. The size of the cranial crest also a major factor for the selection.

Option C). is TRUE. Theropods are highly socialized animal. They try to communicate with each other and prefer to hunt their prey in groups.

Option D). is FALSE. Theropods have hollow bones and long tails.

Thus the wrong statement is ---

D) Theropod balance was aided by the near vertical position of the vertebral column.  

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explanation:

well this isn't a question but if you are asking if it is true or false it is, true.