A 99 percent one-sample z-interval for a proportion will be created from the point estimate obtained from each of two random samples selected from the same population: sample R and sample S. Let R represent a random sample of size 1,000, and let S represent a random sample of size 4,000. If the point estimate obtained from R is equal to the point estimate obtained from S, which of the following must be true about the respective margins of error constructed from those samples? 
选项为:A:The margin of error for S will be 4 times the margin of error for R.  B:The margin of error for S will be 2 times the margin of error for R.  C:The margin of error for S will be equal to the margin of error for R.  D:The margin of error for R will be 4 times the margin of error for S.  E:The margin of error for R will be 2 times the margin of error for S.  请回答其中一个选项.