Correct Answer - Option 3 : NATION
Words that cannot be formed by using letters of word "DICTIONARY” is:
1) RATION → DICTIONARY → Can be formed
2) DAIRY → DICTIONARY → Can be formed
3) NATION → DICTIONARY → Can’t be formed as there are two N’s in NATION while only one ‘N’ is present in the word DICTIONARY.
4) ACTION → DICTIONARY → Can be formed
Hence, ‘NATION’ is the correct answer.