Concept:This is a letter-number analogy using alphabet positions.Each letter is replaced by its position in the English alphabet.Explanation:Alphabet positions: A=1, B=2, …, Z=26.For the first pair, M is 13 and N is 14.So M×N becomes 13×14.Similarly, F is 6 and R is 18.Thus F×R becomes 6×18.Option C matches this result.