Correct answer: None of these
Pattern: symbol (unique per word) + second-last letter of the word + number of letters. solution→*N8, farm→%M4, grain→@N5, seem→#M4. For 'plants means grain seem': grain and seem retain @N5 and #M4. plants(6 letters, 2nd last=N)→@N6 (new symbol needed), means(5 letters, 2nd last=N)→new code. None of the given options match correctly.