The correct answer is all of them, none of the answers are actually air masses. This is a poorly worded trick question :)
I hope this helps!!
        
             
        
        
        
Answer: Take out the trash regularly, make sure food is stored in secure containers, clean the house regularly, and don't leave perishable foods out for a long time.
 
        
             
        
        
        
That would be A. 
Dicots grow flowers with petals in multiplies of 4 and 5, monocots in multiples of 3. See the attached pic:)