Explanation:

To find Reshma's average speed for the whole journey:

- Calculate the total distance she traveled.

- By bicycle: 45 km

- By car: 80 km

- On foot: 6 km

- Total distance = 45 km + 80 km + 6 km = 131 km

- Calculate the total time taken for the journey.

- By bicycle: 45 km / 15 km/h = 3 hours

- By car: 80 km / 40 km/h = 2 hours

- On foot: 6 km / 2 km/h = 3 hours

- Total time = 3 hours + 2 hours + 3 hours = 8 hours

- Average speed = Total distance / Total time = 131 km / 8 hours = 16.375 km/h

- Rounded to 2 decimal places, this is 16.38 km/h

- Correct Option: Option 1 - 16.38 km/h