Answer:
Option A.
Step-by-step explanation:
Cleisthenes, is the right answer.
Cleisthenes has been regarded as a lawgiver to the Athenians. He was credited with improving the Athenian Constitution and placing Democracy in Athens in the year 508 BCE. He is popularly known as the father of the Athenian Democracy. He was the first person who increased the power of the assembly of the Athenian citizens and reduced the power and privileges of the nobility over the politics of Athens.