The question refers to the period covered by the FSI report, likely the ISFR 2017 which compares data from 2015 and 2017. As per the ISFR 2017, states that showed the maximum increase in forest cover were Andhra Pradesh, Karnataka, Kerala, Odisha, and Telangana. Tamil Nadu also registered an increase in forest cover. Given the options, both Tamil Nadu (A) and Kerala (C) recorded an increase in their forest cover during the period covered by the report. Therefore, option D, which states "Both (A) and (C)", is the correct answer.