Why did the Allies attack the Ottomans on the Gallipoli Peninsula in 1915? a The Allies wanted to punish the Ottomans for the Armenian genocide.
b The Allies had hoped to supply Russia by way of a southern sea route.
c The Ottomans had recently switched sides by fighting with the Austrians.
d The Ottomans pledged to send troops to support the Germans on the Western Front.

D

Explanation:

d The Ottomans pledged to send troops to support the Germans on the Western Front.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

an era of negotiation.

is that an answer to your question?