The "sick man of Europe" was a term applied to

A. Hitler.

B. Turkey.

C. Italy.

D. Bismarck.

Well, strictly speaking none of the options are correct.

This is a metaphor, and a metaphor for a country. It was originally applied in 1830s-1850s (within this period, we are not sure when) to what is today Turkey, but was known as the Ottoman Empire back then - so the answer is B.

recently it was used for Greece, too.

It was actualy he Ottama Empier