Ferdinand II, Holy Roman Emperor,
belonged to what famous European
ruling family?

The family of Habsburg

Explanation:

Ferdinand II (1452-1516), was a Holy Roman Emperor,  who belonged to the famous family of Habsburg which ruled Austria for almost 650 years. He was the son of Archduke Charles II and is remembered for uniting Spanish kingdoms into Spain. Following to which he introduced Spain into the imperial expansion. Scholars such as Machiavelli refer to Ferdinand II as the renaissance prince.

i think the answer is   b.