Answer and explanation:
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A postulate is a true statement that does not require to be proved . Also called an axiom.
Answer: Option 'c' is correct.
Step-by-step explanation:
Since we have given that
Sample size = 865 = n
Number of voters favor approval of an issue before the legislature = 408 = x
So, 
At 95% confidence level of significance, z = 1.96
So, confidence interval would be

Hence, option 'c' is correct.