The correct answer is D. G 7.
The maximum length of a runway is the longest distance that an aircraft can take off or land on. The pavement strength of a runway is the ability of the runway to withstand the weight of an aircraft.
Option A: A 1 is a small, private airport with a runway that is only 1,000 feet long. This runway is not long enough for most commercial aircraft to take off or land on.
Option B: B 2 is a small regional airport with a runway that is 2,000 feet long. This runway is long enough for some commercial aircraft to take off or land on, but it is not long enough for the largest aircraft.
Option C: B 3 is a medium-sized airport with a runway that is 3,000 feet long. This runway is long enough for most commercial aircraft to take off or land on, but it is not long enough for the largest aircraft.
Option D: G 7 is a large international airport with a runway that is 7,000 feet long. This runway is long enough for all commercial aircraft to take off or land on.
In conclusion, the maximum length and pavement strength of the runway is that of G 7.