Task: Question Answering
Input (English): Problem: a survey was sent to 65 customers, 7 of whom responded. then the survey was redesigned and sent to another 63 customers, 9 of whom responded. by approximately what percent did the response rate increase from the original survey to the redesigned survey ?
Options: a. 2 %, b. 4 %, c. 14 %, d. 28 %, e. 63 %
Output (English): b