Answer:
D. 10/3
Explanation:
6/7 6 divided by 7 = 0.86 
 proper- doesn't go over 1
 3/10 3 divided by 10 = 0.30
 proper - doesn't go over 1
4/5 4 divided by 5 = 0.8
 proper- doesn't go over 1 
10/3 10 divided by 3 = 3.33
 improper- goes over 1 
PROPER- When divided, DOESN'T go over 1 whole
IMPROPER- When divided, DOES go over 1 whole