4 years ago, the ratio of ½ of A’s age at that time and four times of B’s age at the time was 5:12. Eight years hence ½ of A’s age at that time will be less than B’s age at that time by 2 years. What is B’s present age a. 5 years               b. 8 years      c. 10 years d. 12 years              e. 14 years