By remilitarizing germany, hitler violated
a. the rome-berlin axis.
c. the third reich.
b. the treaty of the allies.
d. the treaty of versailles.

By remilitarizing Germany, Hitler violated the treaty of Versailles. So the correct answer is D. 

The treaty of Versailles was signed after the end of the first World war and among its main points was that Germany would not remilitarize again. This is what Hitler did and violated the point.