Explanation:

- Marathon Distance: The official marathon distance is 42.195 kilometers. This is set by the International Association of Athletics Federations (IAAF).

- Option 1: 42.195 km:

- This is the correct and standardized distance for a marathon race.

- It was established in 1908 during the London Olympic Games.

- Option 2: 46.195 km:

- This distance is longer than the official marathon distance.

- There is no standard race of this length in marathon events.

- Option 3: 43.195 km:

- This is slightly longer than the marathon but is not recognized as a standard marathon distance.

- Marathons do not use this distance.

- Option 4: 44.195 km:

- Like option 3, this distance is not recognized in marathon terminology.

- It is not used in any official capacity for marathons.

Option 1: 42.195 km is the correct answer.