A local hospital tracked the blood type and gender of the patients they saw one day. Which is a fair statement?

Here's the choices...Cause i don't even know the answer to this question...
 
A)Over half of the patients seen on an average day had blood type O.Eliminate
B)Less than 1% of the patients seen on an average day had blood type AB.

C)Double the number of patients seen on an average day had blood type O than blood type B.

D)On an average day they will see about the same percentage of patients with types A and B.