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

Solution : Given:
1. Flexible   2. Flower   3. Flooring   4. Flood   5. Floater

Step 1: The first and second letters of each word are the same. Since all the words start with the same letter F and l . so move on to the next letter.
Step 2: The third letter of each word is either e or o . Based on the alphabetical order of these letters, we can arrange them: Fl e xible, Fl o wer, Fl o oring, Fl o od, Fl o ater.
Step 3: Compare the fourth letter of (Flo w er, Flo o ring, Flo o d, Flo a ter). Floater will come before Flower, Flooring, and Flood in the sequence as a comes before w , and o in the alphabetical system. Similarly, (Flo o ring, Flo o d) will come before Flo w er as o will come before w .
Step 4: Compare the fifth letter of (Floo r ing, Floo d ). Floo d will come before Floo r ing in the sequence as d comes before r in the alphabetical system.

So, the sequence is Flexible, Floater, Flood, Flooring, Flower, or 15432. Hence, the second option is correct.