Known parts	=	10 + 8 + 1/10 = 18 + 0.1 = 18.1
Missing part	=	18.106 - 18.1 = 0.006
0.006 as a fraction	=	6/1000
The missing part is 0.006 = 6/1000. Option B is correct. (10/1000 = 0.01, 9/10 = 0.9, 106/1000 = 0.106).