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C-graphite(carbon )
because salt is nacl 
water is h20 and sand is sio2
1 4 1
yes u r ryt ,,, C is the correct answer
ntn.. i asked the person who posted to edit the ans
Graphite is an element (carbon).. the other three are compound

salt is a any neutral compound having cation and anion
Water is H20
Sand SiO2
0 0 0
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