Correct Answer: 6, 4, 2, 5, 3, 1, 7

Solution : Given:
1. Effluent 2. Edifice 3. Effleurage 4. Edacious 5. Effeminate 6. Eccentric 7. Effulgent

Step 1: Compare the first letter of each word. Since all the words start with the same letter E . So, move on to the next letter.
Step 2: Next, compare the second letter of each word – f , d , f , d , f , c , f . Based on the alphabetical order of these letters, we can arrange them – Eccentric, (Edifice, Edacious), (Effluent, Effleurage, Effeminate, and Effulgent).
Step 3: Compare the third letter of (Edifice, Edacious) and (Effluent, Effleurage, Effeminate, Effulgent). Edacious will come before Edifice in the sequence as a comes before i in the alphabetical system. The third letter of (Effluent, Effleurage, Effeminate, Effulgent) i.e. f is the same.
Step 4: Compare the fourth letter of (Effluent, Effleurage, Effeminate, Effulgent). Effeminate will come first, then (Effluent, Effleurage) and then Effulgent in the sequence as e comes before l and u in the alphabetical system.
Step 5: Compare the fifth letter of (Effluent, Effleurage). Effleurage will come before Effluent in the sequence as e comes before u in the alphabetical system.

So, the sequence is Eccentric, Edacious, Edifice, Effeminate, Effleurage, Effluent, Effulgent or 6, 4, 2, 5, 3, 1, 7. Hence, the first option is correct.