Explanation:

Let's work this out step by step:

- Calculate the time taken for each part of the journey:

- First segment: 120 km at 80 km/h takes $\frac{120}{80}$ = 1.5 hours.

- Second segment: 100 km at 40 km/h takes $\frac{100}{40}$ = 2.5 hours.

- Return trip: Back over 220 km (120 km + 100 km) at 75 km/h takes $\frac{220}{75}$ ˜ 2.93 hours.

- Total distance traveled is 120 km + 100 km + 220 km = 440 km.

- Total time is 1.5 hours + 2.5 hours + 2.93 hours = 6.93 hours.

- Average speed is the total distance divided by total time: $\frac{440}{6.93}$ ˜ 63.46 km/h.

- Therefore, the correct average speed is approximately 63.46 km/h.

- Option 1: 63.46 km/h is the correct choice.