The colossus of rhodes was a 100-foot-tall work made of a. gold b. copper c. marble d. bronze

Option D.

Explanation:

Bronze, is the right answer.

Out of the Seven Wonders of the World, the Colossus of Rhodes is one. This statue was the statue of Helios, the Greek Sun God. This figure was created to memorialize Rhodes' supremacy over the king of Cyprus, whose heir Demetrius I of Macedon unsuccessfully attacked Rhodes in the year 305 BC. This figure was made of bronze and bolstered with iron.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).