Which of the following reflects legislative power in Illinois?

The General Assembly's decisions reflect legislative power in Illinois because the General Assembly is the state's legislative body responsible for creating, amending, and repealing laws. It is a bicameral legislature composed of the Senate and the House of Representatives, where elected representatives debate and vote on proposed legislation. This body holds the authority to enact laws that govern the state, making it the primary source of legislative power.

In contrast, the options that involve the Governor's decree, Supreme Court rulings, and Citizens' initiatives do not represent legislative power in the same way. The Governor's decree pertains to executive authority, while the Supreme Court's rulings are judicial interpretations and decisions. Citizens' initiatives, although they allow for public involvement in law-making, operate under specific conditions and are ultimately processed through the legislative system rather than functioning independently as legislative power.