Hmm, I am not quite sure but if I am probably your best bet so I'd go with, either B or D.
One of the diseases is smallpox and the second is rinderpest
1)sodium chloride/common salt
2)sodium hydroxide
3)sodium carbonate/washing soda
4)sodium bi-carbonate/baking soda
5)calcium hypochlorite/bleaching power
6)hemihydrate calcium sulphate/plaster of Paris
7)calcium sulfate
8)copper sulfate
9)bororn trifluoride
10)potassium nitrate
I could only find ten examples
What are you trying to ask??????
