The hittites are best known for their development of this technology. iron bronze steel copper

Iron is the correct answer.

Explanation:

The Hittites are known for developing the techniques for iron usage around 1500 BC.  Earlier they were using Bronze. Bronze is harder than Iron, The Hittites started to Use Iron weapons which gave them an edge over its rivals and forming the Hittite empire.  When the Hittite empire fell the iron smiths migrated to other places and disseminated the knowledge of  ironwork. The Hittites were made up of several Indo-European speaking tribes. They occupied Anatolia in 17th century BC. They embarked on successful military campaigns due to the use of iron weapons and chariots.

the ss was the main organization responsible for the genocidal murder of around six million people of european ethnic minorities, essentially jews, in the holocaust. the members of all its branches committed war crimes and crimes against humanity during the second world war (1939-1945). likewise, the ss were involved in commercial enterprises and exploited the inmates of the concentration camps as slave laborers.

the tortures and assassinations committed by the ss were the result of an ideology developed long before the armed conflict, this ideology was based on the racial supremacy of the germans over the rest.

wait history, who want to talk about history, boring.