It's a complete sentence because it's able to stand alone and it makes sense.
the US marine corps used it first in ww2
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.
Yes its possible to become to attached to a material object because it can prevent you from reality , time with family and friends, or it could affect your physical wellbeing. If i had become attached to a material object I would distance myself from it slowly and then eventually take a break from it all together until I believed it was something I could do without.
I think the answer would be A) Imagination and emotion; reason and intellect