Final answer:
The political development of the Philippines fostered a culture of citizen participation and led to increased political instability during Ferdinand Marcos' regime.
Step-by-step explanation:
The political development of the Philippines has had a significant impact on the country's political landscape. One effect of this development is increased political instability (Keyword: political instability). This can be seen during Ferdinand Marcos' authoritarian regime, where social unrest and opposition to his leadership escalated (Keyword: Ferdinand Marcos). Additionally, the political development fostered a culture of citizen participation, as seen through reforms and the empowerment of resistance leaders in exchange for political appointments from the Taft Commission (Keyword: citizen participation, Taft Commission). Therefore, option C, fostering a culture of citizen participation, is the correct answer.