Concept:The word can be formed only if its letters are available in UNIFORMITY with the same or lower count.Explanation:Letters in UNIFORMITY: U,N,I,F,O,R,M,I,T,Y.Counts: U=1,N=1,I=2,F=1,O=1,R=1,M=1,T=1,Y=1.FORUM needs F,O,R,U,M, all available.MINT needs M,I,N,T, all available.UNIFORM needs U,N,I,F,O,R,M, all available.ANNUITY needs A,N,N,U,I,T,Y.Here A is absent and N appears only once, so it cannot be formed.Answer:ANNUITY