Final answer:
The Allies aimed to open up a supply route to Russia during the Gallipoli campaign by securing passage through the Dardanelles and Bosporus straits.
Explanation:
The goal of the Allies during the Gallipoli campaign was B. to open up a supply route to Russia. The campaign aimed to secure a passage through the Dardanelles and Bosporus straits, allowing access to the Black Sea and establishing a supply route to aid Russia in the war.
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