Correct Answer: Oxford

Solution : Given:
1. Onion  2. Owl  3. Omnious  4. Ostrich  5. Oxford

Step 1: Compare the first letter of each word. Since all the words start with the same letter O , move to the next letter.
Step 2: The second letters of the given words are n , w , m , s , and x respectively. Based on the alphabetical order of these letters, now arrange the words – O m nious, O n ion, O s trich, O w l, O x ford.

Therefore, Oxford will appear last in the sequence. Hence, the third option is correct.