In which type of system do citizens have some rights to participation if they are wealthy and powerful? a) autocracy b) democracy c) monarchy d) oligarchy

The answer to your question is D oligarchy. 
An autocracy is a political system where a single person (like a dictator) wields absolute power.
A democracy is a political system where a large portion of the population decides laws by voting.
A monarchy is a political system where a single family or dynasty rules by royal decree.

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