Please, I want a clear and correct solution in the shortest possible time, within a maximum of an hour, thanks

A local steel pipe manufacturing company makes pipes. In a quality control assessment, a total of five (05) samples are collected with four (04) observations within each sample. The sample means (X-bar) are; 14.09, 13.94, 16.86, 18.77, and 16.64 respectively. Next, the corresponding ranges are; 9.90, 7.73, 2.89, 7.56, and 3.49 respectively. The lower and upper control limits of the R-chart are respectively O a. 0, 14.40 O b. None is correct O c. 0,13.32 O d. 14.40, 0 O e. O, 12.32