Answer:
The answer to the question: What did Herodotus and Thycydides establish as a field of study? would be, B: History.
Explanation:
Around the 400´s BC, there lived in Greece a couple of men whose writings on events that were taking place in the lands where they lived became known as the first historical writings to ever exist. These two men were: Herodotus, who wrote about the wars between Greece and Persia on his book "The Histories", which were just a group of papyrus on which Herodotus recorded all about the First and Second Persian War.
The second person was Thucydides, who also recorded historical events on papyrus, much like Herodotus did, but he worte mostly on the Peloponnesian War in 431 BC. All the historical records that Thycidides generated were regarding the wars that arose between Athens and Sparta that made part of the Peloponnesian War.
