The geneva convention established rules for
a.
the treatment of prisoners of war
b.
encrypting messages
c.
building up arms
d.
converting ccc camps into internment camps

a.  the treatment of prisoners of war

Explanation:

The Geneva Convention established rules for the treatment of prisoners of war.

a.  the treatment of prisoners of war

Explanation:

The Geneva Convention for the first time established in 1864 and replaced in 1906 when the Swiss government planned a conference of 35 states to review and update the previous laws. The Geneva Convention made rules for the protections to those captured, wounded in battle. The Geneva Convention also applies to medical personnel assigned in battle while taking care of soldiers.        

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.