According to the professor, what conclusion can be drawn from what is now known about corvids' brains? A. The area in corvid's brains that governs cognitive functions governs other functions as well. B. Corvids' brains have evolved in the same way as other birds' brains, only more rapidly. C. Corvids' and primates' brains have evolved differently but have some similar cognitive abilities. D. The cognitive abilities of different types of corvids vary greatly.