Correct Answer: 3, 2, 4, 1

Solution : Given:
1. Silt 2. Silicon 3. Silicate 4. Silken

Step 1: Compare the first letter of each word. Since all the words start with the same letter S . So, move on to the next letter.
Step 2: The second and third letters of each word are the same, i.e., i and l , so move on to the next letter.
Step 3: Compare the fourth letter of (Sil t , Sil i con, Sil i cate, Sil k en). (Silicon, Silicate) will come before Silt and Silken as i comes before t and k in alphabetical order. Similarly, Silken will come before Silt as k comes before t in alphabetical order.
Step 4: The fifth letter of Silicon and Silicate is the same, i.e., c . So, move on to the next letter.
Step 5: Compare the sixth letter of (Silic o n, Silic a te). Silicate will come before Silicon as a comes before o in alphabetical order.

So, the sequence is Silicate, Silicon, Silken, Silt, or 3, 2, 4, 1. Hence, the second option is correct.