The correct answer is B. Herodotus.
Herodotus was a Greek historian who lived from 484 to 425 BC. He is considered the father of history. His most famous work is The Histories, which recounts the Greco-Persian Wars.
Euclid was a Greek mathematician who lived from 325 to 265 BC. He is considered the father of geometry. His most famous work is The Elements, which is a collection of mathematical proofs.
Aristotle was a Greek philosopher who lived from 384 to 322 BC. He is considered one of the greatest philosophers of all time. His most famous works are The Nicomachean Ethics and The Politics.
Caesar was a Roman general and statesman who lived from 100 to 44 BC. He is considered one of the greatest military commanders in history. His most famous work is The Gallic Wars, which recounts his conquest of Gaul.
Euclid, Aristotle, and Caesar were all important figures in ancient history, but none of them wrote the first history book. The first history book was written by Herodotus.