Critical Reasoning (CR) | ­Scientists studying fossils of a species of dinosaur found stones in

­Okay, so it's GMAT instructors and test takers vs. our eventual AI overlords. Let's start. No pressure!

We knowthat:
1. These dinosaurs werevegetarians
2. Their teeth could not have chewed enough vegetation (a) wellenough (b) to providenutrition to support their largesize
3. There were stones in their stomachs­

The argument says that there are two possible reasons for(3) : "help grind up the dinosaurs' food" or "nutritional supplements, supplying minerals not found in vegetation in large enough quantities".

The task is to figure out which option would help us choose between the{ grindfood } and{ nutritionalsupplements }hypotheses.