Recent research in an old quarry uncovered tracks from several Stegosaurus dinosaurs, and the tracks all headed in the same direction. A second set of tracks from the same quarry shows one instance of overlapping footprints, where a juvenile Stegosaurus footprint was stepped on by an adult Stegosaurus. From this one can infer that Stegosauruses most likely traveled in multiple-age herds and that adults of this species cared for their young.

Which of the following is an assumption on which the argument depends?

Correct answer marked below

Many modern herd animals care for their young.

Male and female adult Stegosauruses traveled together in the herd.

No tracks from dinosaurs other than Stegosaurus were found in the vicinity of the Stegosaurus tracks.

The adult dinosaur print was made at the time the juvenile print was made.

Correct

The existence of parental care has been established for other dinosaur species.

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What this question tests

Whether you can identify the unstated assumption a critical-reasoning argument depends on.

Picking an option that strengthens the argument or is merely relevant instead of one that is required.