Answers

2014-12-20T21:34:11+05:30
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
edit
???
ntn.. i asked the person who posted to edit the ans
kk
2014-12-20T21:37:26+05:30
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
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