A, B and C traffic police have come to the following conclusion after the safety check of the city's passenger cars during this spring festival: A: all the passenger cars are overloaded  B: there is no overload problem on all the city's passenger buses
C: both Ruyi's and Jixiang's buses are overloaded
A, B, C and Ruyi's passenger cars and Jixiang's passenger cars are not overloaded.