Need help with geometry (updated)

What is the value of AC – EF?

M. A. B. C. D. O. E. F. G. H. N
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-5. -4. -3. -2. -1. 0 1 2. 3. 4. 5


Choices:

A. -5
B. -3
C. -1
D. 1 <--- Correct answer, just took the test


I think it might be 1 but I don't know for sure.

My reasoning:

|-4 - (-2)| - |1-2|
|-4+2| - |-1|
|-2| - |-1|
2 - 1
1