Correct Answer: 4, 2, 1, 5, 3

Solution : Given:
1. Delta 2. Delicious 3. Depend 4. Daffodil 5. Demography

Step 1: Compare the first and second letters of each word. Since all the words start with the same letter D , and are followed by e then move on to the next letter.
Step 2: The third letter of each word is either f , l , m , or p . Based on the alphabetical order of these letters, we can arrange them – Da f fodil, De l ta, De l icious, De m ography, De p end.
Step 3: Compare the fourth letter of (Del t a, Del i cious). Del i cious will come before Del t a in the sequence as i comes before t in the alphabetical system.

So, the sequence is Daffodil, Delicious, Delta, Demography, Depend, or 4, 2, 1, 5, 3. Hence, the third option is correct.