I will go for E.
Let's look at the line of reasoning by the author.
Evidence- loss of control incidents reported at two companies, and the new proposed drones did not have any safeguards to prevent such incidents
Conclusion- If the delivery from drones increases, there will be an increase in incidents.
The question asks to weaken the argument.
Prethinking: The author thinks that the incidents happened because the existing safeguards were not sufficient, or there were no safeguards in the drones. He assumes that only adding the safeguards will prevent the incidents from increasing.
So if we prove that the author's thinking is wrong with some other reasons, then that will be our weakner.
Option E gives us the reason that the incidents happened because the operators were not trained enough.
Now, why are other options incorrect:
A. This gives extra info about the incidents that happened, but it didn't provide us with any reason to doubt the conclusion. Not relevant
B. Unnecessary comparison between entities.
C. This states that drones are not needed, which means the old drones will transport the package. So, what we still cannot question the conclusion
D. New vs Old fleet of drones and frequency of both fleets are the same, and if the number of drones increases, the incidents increase. Hence, it strengthens rather than weakens.
Bunuel
Increased use of autonomous delivery drones is sometimes advocated as a safe way to transport packages in crowded urban areas. But opponents of drone delivery point to the 60 incidents involving unexpected loss of control that were reported just last year at two existing drone-delivery companies operating in major cities. Since designs for proposed new drone fleets include no additional safeguards to prevent such losses of control, accidents will only become more prevalent if use of drone delivery increases.
Which of the following, if true, most seriously weakens the argument?
(A) In only a small fraction of the reported incidents did a drone’s loss of control result in property damage or injury.
(B) Other methods of package delivery, such as bicycle couriers, have not been proven less accident-prone than drone delivery.
(C) The current fleets at existing drone-delivery companies are large enough to handle increased delivery volume without any need for new drones.
(D) The frequency of unexpected loss-of-control reports in newly launched drone fleets is about the same as the frequency in older fleets.
(E) At the two companies where losses of control were reported, many drone operators had received only minimal training on how to intervene when automated systems malfunctioned.
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