Which was an effect of the new burmese constitution in 1974? a. multiple political parties were legalized. b. the right to citizenship was defined. c. a bicameral legislature was created. d. voting rights were restricted.

Voting rights I believe were restricted in that only one party the Socialist party was allowed. Some socialist countries at least where power was obtained by revolution in the world, like the Soviet Union or in Cuba had/have a one party system but still have democratic votes for various things, whereas more recently, socialist governments have come to power through the ballot box in countries like Venezuela or Bolivia. 

Your answer is D. Voting rights were restricted I could explain why and give you a lot of information on how this is the correct answer since I just went over this topic, but the other person already did that so here's just your plain answer.