Concept:The hexadecimal or base-16 number system uses sixteen unique digits.Explanation:The digits start from 0 to 9, which gives ten digits.The remaining six digits are the letters A,B,C,D,E, and F.So the sequence of hexadecimal digits is 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.Hence, the digit that follows A in the list is F.Answer:FOption B.