Solution:Option (c) was correct when this question was asked. After the reorganization of Andhra Pradesh, the scenario of States and their borders is as follows-Andhra Pradesh borders with Odisha, Chhattisgarh, Telangana, Karnataka and Tamil Nadu. If the Yaman region of Pondicherry (now Puducherry) is also taken into consideration the number of States/Union Territories bordering Andhra Pradesh will be six.
Karnataka shares boundaries with six states - Andhra Pradesh, Telangana, Maharashtra, Goa, Kerala and Tamil Nadu.
Kerala shares border with 2 States - Karnataka and Tamil Nadu. If the Mahe region of Pondicherry (now Puducherry) is included the number of States/Union Territories bordering Kerala will be three.
Tamil Nadu shares border with three states-Kerala, Karnataka and Andhra Pradesh and including Pondicherry (now Puducherry), the number of States/Union Territories will be four.
Telangana borders with Chhattisgarh, Maharashtra, Karnataka and Andhra Pradesh.
Thus presently Karnataka shares border with maximum number of states.