The current age ratio of 'A' to 'B' is 5:7, and their combined age is 48 years. The age of 'A', after 'n' years, will equal the age of 'B' from 'n' years ago. Additionally, the present age of 'C' is (3n−4)(3n - 4) years less than 'A's current age. Determine the present age of 'C'. A. 8 years B. 16 years C. 15 years D. 10 years E. 12 years