Mashaal Masha
Cheng Dang and her colleagues at the University of Washington recently ran simulations to determine the extent to which individual snow ________ affect the amount of light reflecting off a snowy surface.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A: 

grain's physical properties'

B: 

grains' physical properties

C: 

grains' physical property's

D: 

grains physical properties

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