Coding YEMEN from FRANCE and GERMANY

Check if this is a direct substitution cipher by comparing letters that appear in both reference words. The letter 'E' is the last letter in FRANCE (1) and the second letter in GERMANY (1). The match confirms direct substitution. The letter 'N' is the 4th in FRANCE (3) and 6th in GERMANY (3). Match confirmed. Map the required letters for YEMEN directly from the given words: Y = 7 (last in GERMANY) E = 1 (last in FRANCE) M = 8 (4th in GERMANY) E = 1 N = 3 (4th in FRANCE) Concatenating these gives 71813.

Answer: (d).