The passage shows that the equipment the German military could maintain was 100 unarmed seaplanes.
After WWI, the Allies did not want the Germans having much equipment in their army so that they would no longer pose a threat.
As a result, they stripped them of their arms and munitions but allowed them to have 100 seaplanes which were not to be armed and were to be used to search for submarine mines.
In conclusion, option C is correct.
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