All of the options listed are parts or ideas that can be found in the Florida State Constitution:
A. Republican form of government - The Florida Constitution establishes a government based on republican principles.
B. Two methods for proposing Amendments - The Constitution outlines specific methods for proposing amendments.
C. Preamble - The Florida Constitution includes a preamble that states its purpose and guiding principles.
D. Three branches of government - The Florida Constitution establishes the separation of powers among the executive, legislative, and judicial branches of government.
In summary, all responses A, B, C, and D are correct.