What does the levelling (balancing) movement in the front axle of the tractor contribute to?

1. AImproving the stability of the tractor when driving on an extreme side slope.
2. BImproving the stability of the tractor when driving over uneven terrain.
3. CImproving the comfort of driving the tractor on straight roads and paths.
4. DImproving the stability of the tractor when driving on fast roads and paths.

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