which best describes the historical (2009-2020) and projected (2021-2030) enrollment rates for K-12 student enrollment? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer. a Enrollment rates are expect to slightly decline from 2020 to 2030. b Enrollment rates are expect to sharply decline from 2020 to 2030. c Enrollment rates are expected to stay flat between 2020 and 2030. d Enrollment rates are expected to increase between 2020 and 2030