Why were tanks developed during world war i?
a) to provide shelter from poison gas
b) to carry heavy anti-aircraft guns
c) to protect soldiers when they attacked trenches
d) to be advance scouts for infantry

If i i am correct they were made for trench warfare  so c although i thank they might all be correct because they had big cannons on them which did take out aircraft and they could block off the barrel so they could shelter ppl from gas and they can can scouts for infantry because they can remove any hostile infanty so as far as im aware it can be all but i looked it up and it said it was c so go with that