true or false.

A A. The length of a confidence interval can be determined if you know only the margin of error

B. The margin of error can be determined if you know only the margin of error

C. The confidence interval can be obtained if you know only the margin of error

D. The confidence interval can be obtained if you know only the margin of error and the sample mean

B. Decreasing the confidence level whle keeping the same sample size____________ the margin of error and ________ the accuracy of estimating a population mean by a sample mean.

C. Explain why the margin of error determines the accuracy with which a sample mean estimates a population mean

I understood the first couple of questions in part A but it became confusing. thank you