Which of the following pieces of evidence supports the hypothesis that dinosaurs were social creatures?

a. The presence of crests and frills on their skulls

b. The existence of eggs demonstrating oviparity

c. A juvenile that looks like a smaller copy of the adult.

d. A solitary set of footprints in a trackway.

Option d. A solitary set of footprints in a track way

Explanation:

This can be explained by the researches of Paleontologists who, after studying the fossils of dinosaurs found out the footprints of 3 tyrannosaurs evident of their hunting in packs which shows and also the footprints of birds and dinosaurs which includes both plant and flesh eaters in a track way are evident of the fact that dinosaurs were social creatures.