pls note that this a business statistics question

Question 15

Suppose a 95% confidence interval for the population mean turns out to be (1,000, 2,000). To make more useful inferences from the data, it is desired to reduce the width of the confidence interval. Which of the following will result in a reduced interval width?

a. Increase the confidence level

b. Increase the population mean

Selected: c. Increase the sample meanThis answer is incorrect.

d. Increase the sample size