Help with part b please fast just part b

A random sample of 21 men's resting pulse rates showed a mean of 71.1 beats per minute and standard deviation of 17.2. Assume that pulse rates are Normally distributed. Use the table to complete parts (a) through (c) below. Click the icon to view the t-table. a. Find a 95% confidence interval for the population mean pulse rate of men, and report it in a sentence. Choose the correct answer below and, if necessary, fill in the answer boxes to complete your choice. (Type integers or decimals rounded to the nearest tenth as needed. Use ascending order.) A. We are 95% confident that the population mean resting pulse rate is between 63.3 and 78.9 O B. We are 95% confident that the sample mean resting pulse rate is between and O C. There is a 95% chance that all resting pulse rates will be between and O D. The requirements for constructing a confidence interval are not satisfied. b. Find a 90% confidence interval and report it in a sentence. Choose the correct answer below and, if necessary, fill in the answer boxes to complete your choice. (Type integers or decimals rounded to the nearest tenth as needed. Use ascending order.) O A. We are 90% confident that the sample mean resting pulse rate is between and O B. There is a 90% chance that all resting pulse rates will be between and O C. We are 90% confident that the population mean resting pulse rate is between and O D. The requirements for constructing a confidence interval are not satisfied