Answer:
A). Comparing and contrasting different findings on autonomous vehicles.
B). “Some research included in this roundup indicates that the environmental effects of widespread adoption of autonomous vehicles might not be positive. Safety benefits are not so clear-cut either."
Step-by-step explanation:
In the given passage, the author compares various findings that have been discovered regarding autonomous vehicles. The description of researches like 'a lawsuit that took place between Uber and Waymo, NHTSA's discovery, Google's experiment of self-driven car, etc. aims to inform the readers about the various researches on such vehicles and the outcomes that have been observed regarding it.
The quotation 'some...either' functions to negate the claim that automated vehicles have lately been welcomed by people as it talks about the negative impact caused by them i.e. 'environmental impact.' The 'unclarity of safety benefits' further substantiate this denial and make the counter-claim stronger and affects the validity of this claim.