In this question a few conclusions are drawn from two or more given statements. It is based on deductive reasoning rather than inductive reasoning. You have to consider the given statements to be true, even if they are different from established facts and accordingly choose the right answer.
Statements:
I) All cars are buses
II) All buses are trains

Conclusions:
I) Some trains are buses
II) Some trains are cars

Both I and II follow

As per above figure, it is clear that:

I) Some trains are buses
II) Some trains are cars

Therefore, Both I and II follow.