Not C.
https://www.google.com/search?q=key+battle+between+Great+Britain+and+Turkey+wwi&oq=key+battle+between+Great+Britain+and+Turkey+wwi&aqs=chrome..69i57.7921j0j7&sourceid=chrome&ie=UTF-8
What was a key battlefront between Great Britain and Turkey in World War I?
Battle of Verdun
Gallipoli Campaign
Brusilov Offensive
Battle of the Somme
c?
3 answers
France and Germany fought In the Battle of Verdun.
Russia and Austria-Hungary fought in Brusilov Offensive.
Britain and France fought against Germany in the Battle of the Somme.
Russia and Austria-Hungary fought in Brusilov Offensive.
Britain and France fought against Germany in the Battle of the Somme.
In other words, the answer is the Gallipoli Campaign :)