Explanation:

Let’s break down the hierarchy and what each term means:

- PGT (Post Graduate Teacher): School teaching position after Master's degree.

- Assistant Professor: Entry-level teaching position in colleges/universities.

- Associate Professor: Mid-level position above Assistant Professor.

- Professor: Senior-most academic post in a college/university.

Now, arranging them logically from lowest to highest:

- PGT < Assistant Professor < Associate Professor < Professor

Let’s check the options:

- Option 1: I, II, III, IV (Assistant Prof, PGT, Professor, Associate Prof) – Not in order.

- Option 2: I, III, IV, II (Assistant Prof, Professor, Associate Prof, PGT) – Not in order.

- Option 3: IV, II, I, III (Associate Prof, PGT, Assistant Prof, Professor) – Not in order.

- Option 1: II, I, IV, III — is the correct order. (But this wasn’t in your provided options, so let’s check yours specifically.)

- Option 4: III, IV, I, II (Professor, Associate Prof, Assistant Prof, PGT) — this is the reverse (highest to lowest), not lowest to highest.