I 4-2 I : 5 - 3 :: _____ : 10^-3
a. 1/100 b. 1/1000 c. 0.1 d. 4-2
1/1000
The absolute value of I 4-2 I is 2, and 5 - 3 equals 2 as well. 1/1000 is also the equivalent of 10^-3.