Final answer:
Democracy was introduced to Athens in the sixth century BCE, with critical reforms occurring around 508 BCE when Cleisthenes enabled all male citizens to vote and hold office, creating a system often cited as the first true democracy. The correct option is b.
Step-by-step explanation:
Democracy was introduced to Athens around the sixth century BCE. The process through which Athenian democracy developed was gradual and evolved from earlier forms of governance.
By the eighth century BCE, Athens' growing prosperity led to demands for more say in the city's functioning from wealthier families, which set Athens on a path toward democracy.
Around 600 BCE, the ruler Solon implemented reforms that paved the way for a more inclusive system, though it was still not fully democratic. It wasn't until 508 BCE that Cleisthenes was appointed and introduced reforms that allowed all male citizens to vote and serve in public office, making Athens the first 'real' democracy.
This system included not only the wealthy but also free, poorer citizens, expanding participation beyond the aristocracy. The correct option is b.