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Because this is a typical optimization problem
D - D is correct- his option combines two techniques: downsampling and upweighting. While a 1:1 ratio is often the goal, a 10% positive example ratio is a significant improvement from the original less than 1% and can be a practical compromise.
C: People are required to let you know ahead if they show up. You don't need to model whether people are going to be present in a station. Also, logically, the cost of not picking up people is significantly higher than the route taking a little more time. So, A and B, though possible, would not be optimal given that you already know where the people are located.