There are many different ways that this could be answered, but I believe that the answer is B, Safety. This is because self driving cars are programmed to work by following rules e.g. staying in the lines, stopping at the traffic lights etc. Also, they have no emotion so they can't flip out and drive like crazy and can't be rebellious as they aren't programmed like that. However, if they aren't programmed properly there would be havoc and chaos.
