We can start from the root node which contains an attribute of Travel cost per km$.$

If the travel cost per km is expensive, the person uses a car.

If the travel cost per km is the standard price, the person uses a train.

If the travel cost is cheap, the decision tree needs to ask the next question about the gender of the person. If the person is a male, then he uses a bus.

If the gender is female, the decision tree needs to ask again how many cars she owns in her household.

If she has no car, she uses a bus,

Otherwise, she uses the train.