Refer to figure.
Tyre inflation pressure directly determines the geometry of the contact patch between the tyre tread and the runway surface. When a tyre is inflated to the correct pressure, the contact patch is uniform across the full width of the tread and the load is distributed evenly, producing even wear across the tread surface.

When a tyre is over-inflated, the excess internal pressure causes the tyre carcass to become excessively stiff and the tread to crown outward in the centre, reducing the effective contact patch width. The central portion of the tread bulges outward and bears the majority of the contact load causing excessive wear. The outer shoulder edges of the tread lift slightly away from the runway surface and carry a reduced share of the load. 

Sustained operation in this condition causes the central tread to wear faster than the shoulders, producing the characteristic central tread wear pattern associated with over-inflation. This is the direct opposite of the under-inflation pattern, where the sidewalls flex excessively, the centre lifts, and the outer shoulder edges bear the load, producing edge wear. 

Excessive tread wear in the centre of the tyre → CORRECT. Over-inflation stiffens the tyre carcass and causes the central tread to crown outward, concentrating the contact pressure and load in the centre of the tread. This produces accelerated and disproportionate wear in the central tread zone while the outer shoulders remain relatively unworn. This is the classic and definitive wear pattern produced by over-inflation and is the correct answer.

Excessive tread wear on the outside of the tyre → INCORRECT. Outer edge (shoulder) tread wear is the characteristic result of UNDER-inflation, not over-inflation. An under-inflated tyre deforms under load such that the central tread lifts and the outer shoulders bear the majority of the contact load, causing accelerated shoulder wear. 

Scuff marks on the outside of the tyre → INCORRECT. Scuff marks on the tyre sidewalls or outer surface are typically produced by ground contact with kerbs, taxiway edge lights, or other ground obstructions, or by excessive tyre scrubbing during crosswind landings. They are not a characteristic result of over-inflation. 

Flat spots in the centre of the tyre → INCORRECT. Flat spots are caused by wheel lockup during braking, where a non-rotating tyre slides along the runway surface and grinds away a localised flat area on the tread. This is a braking technique or anti-skid failure issue and is entirely unrelated to inflation pressure.