Question

in october 1914, the ottoman empire made an alliance with germany. it became one of the central powers. why did it decide to join the war?
to convert the allied powers to islam
to take over all of europe
to protect the borders of its empire
to get back at great britain for taking the city of jerusalem

Explanation:

The Ottoman Empire joined WWI to counter territorial threats from Allied powers (e.g., Russia, Britain) that aimed to expand into its declining empire. Converting Allies to Islam, taking over Europe, and revenge for Jerusalem were not primary motives. Protecting its borders aligns with historical context of defending remaining territories.

Answer:

to protect the borders of its empire