In 1915 the British and French forces launched an ill-fated naval attack on Turkish forces in the Dardanelles in northwestern Turkey. The failure of the attack resulted in significant casualties and resources for the British and French.
I think it is B.) Caravan
The correct answer is c. to discuss plans to build an atomic bomb
The creation of the Atomic bomb was a secret and the world found out about it when it was thrown in Japan. This was not discussed at the Tehran conference.
The bering strait is the land bridge