This answer is not correct. The absorption between 3500 cm-1 and 2500 cm-1 is the key to this problem since all the possible compounds contain a benzene ring. The amine nitrogen-hydrogen stretching absorptions show two bands that occur at 3500 cm-1 and 3400 cm-1 and these bands are not nearly as broad and as strong as the absorption in this spectrum. You are on the right track, think about where the other compounds absorb and try again.