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

Solution : Given:
1. Phantom  2. Photograph  3. Philosophy  4. Physical  5. Pharynx  6. Physics

Step 1: Since all the words start with the same letter P and H , we move to the next letter.
Step 2: The third letter of each word is: a , o , i , y , a , y . Based on the alphabetical order of these letters, we can arrange them: Phantom, Pharynx, Philosophy, Photograph, Physical, Physics.
Step 3: Compare the fourth letter of (Pha n tom, Pha r ynx) and (Phi l osophy, Pho t ograph). Phantom will come before Pharynx in the sequence as n comes before r in the alphabetical system. Similarly, philosophy comes before Photograph.
Step 4: Compare the seventh letter of (Physic a l, Physic s ). Physical will come before Physics in the sequence as a comes before s in the alphabetical system.

So, the sequence will be Phantom, Pharynx, Philosophy, Photograph, Physical, Physics or 1, 5, 3, 2, 4, 6. Hence, the third option is correct.