A. If duckbills whipped their tails faster than monitor lizards do, the duckbill's tail would have been effective at warding off the duckbills' fiercest predators.: outside info, we cannot confirm that they would. I mean if they would - great but we can't be sure.
B. Duckbills used their tails to strike predators, and their tailbones were frequently damaged from the impact.: not mentioned in the passage, this is outside information.
C. Using their tails was not the only means duckbills had for
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B. Duckbills used their tails to strike predators, and their tailbones were frequently damaged from the impact.: not mentioned in the passage, this is outside information.
C. Using their tails was not the only means duckbills had for
...
