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

Solution : Given:
1. Lesage 2. Laudatory 3. Laureate 4. Latitude 5. Legacy 6. Laudanum 7. Launder

Step 1: Compare the first letter of each word. Since all the words start with the same letter L , move on to the next letter.
Step 2: The second letter of each word is either e or a . Based on the alphabetical order of these letters, we can arrange them – L a udatory, L a ureate, L a titude, L a udanum, L a under, L e sage, L e gacy.
Step 3: Compare the third letter of (La u datory, La u reate, La t itude, La u danum, La u nder) and (Le s age, Le g acy). Therefore, the order is Latitude, (Laudatory, Laureate, Laudanum, Launder), Legacy, Lesage.
Step 4: Compare the fourth letter of (Lau d atory, Lau r eate, Lau d anum, Lau n der). Therefore, the order is (Laudatory, Laudanum), Launder, Laureate.
Step 5: Compare the sixth letter of (Lauda t ory, Lauda n um). Laudanum will come before Laudatory as n comes before t in alphabetical series.

So, the sequence is Latitude, Laudanum, Laudatory, Launder, Laureate, Legacy, Lesage, or 4, 6, 2, 7, 3, 5, 1 . Hence, the third option is correct.