Context: Read the text about Alex the parrot.
Most parrots can speak, or at least copy the sounds of people talking. Alex, an African grey parrot, learned to do much more. He knew how to do simple math. In fact, he was capable of adding up to six objects. Alex added up crackers, jelly beans, and blocks. He could also point out seven different colors and six shapes. And he knew more than a hundred words!
Alex's owner taught him for more than thirty years and observed a lot about how parrots learn. People had worked with animals before Alex to see if animals could understand language and math. But Alex proved that animals might be even smarter than we thought!
Based on the text, what was one of the things that made Alex different from most parrots?
A. He loved playing with blocks.
B. He was an African grey parrot.
C. He was able to do math.
Determine the correct option from the provided choices and reply with its corresponding letter.
Answer: C