Fossils of Early Crocodiles Show That Early Crocodiles Must Have

Fossils of early crocodiles show that early crocodiles must have eaten a mainly vegetarian diet, as they are not found near any fossils of living creatures that would have served as the crocodiles' prey. Instead, they are found near fossils of different kinds of vegetation, many of which no longer exist today. Skeletons of modern crocodiles, on the other hand, are often found near those of other animals, showing that the diet of crocodiles has changed over thousands of years.
Which one of the following, if true, would strengthen the conclusion of the preceding paragraph?

A) Recent research has shown that crocodiles have remained virtually the same size and shape for thousands of years.
B) Skeletons of ancient animals are rare, as most deteriorated or were eaten by scavengers before fossilizing.
C) Scientists cannot reliably estimate the age of a fossil.
D) Modern crocodiles have been shown to eat both plants and animals.
E) In research completed across hundreds of species, paleontologists have proven that animal and plant fossils and skeletons found near predator animals are a reliable indicator of their food source.