Option A is the correct answer.
Let's understand the information mentioned in the passage before trying to get the answer.
So the passage starts by telling us that some of the industry commentators are arguing that the recent surge in malicious mobile apps found in independent app markets are the result of new restrictions which the major app stores have implemented on their platforms. The the passage goes on by telling that after all this still no developer is removed from the major app platform the people whom the commentators believed to be the culprits of these malicious mobile apps, and now they have released a new on the alternative marketplace i.e. the independent app markets.
Now the question asks us which one of the following option if true weakens the commentators argument.
Option A: "Many of the malicious apps found on independent marketplaces resemble legitimate apps removed from major platforms and are offered by unrelated developers". This option tells us that the malicious apps which are available on independent market place are exactly the same as the legitimate apps which were removed from the major app platforms and these apps are offered by the developers who are not related to the major app marketplace. After understanding this option we can tell that this option clearly weakens the commentators argument i.e. "they suspected the developers working at major app markets place to be behind these malicious apps" and this option also tells that these apps are the same as the apps that were previously available on the major app marketplace. But before concluding our answer let's read other options as well.
SelectedOption B: "Historically, the independent marketplaces have had far fewer resources to detect and remove malicious apps than major app-store platforms do". This option tells that the independent marketplace always have fewer resources to detect and remove malicious apps which does not weakens the argument instead strengthens it as the developers will try to take benifit of rhis loophole and launch their malicious apps which gets rejected from major app markets.
EliminatedOption C: "Shortly after the policy changes were announced, several new developer groups began targeting independent marketplaces to distribute apps with fewer compliance checks". This option talks about what is being done by a proportion of developers on the independent app market but we are not concerned about it, what we are concerned about is the availability of malicious apps on the independent app market for which the developers who work at major app market are suspected. In if we see this option slightly strengths the argument in some way.
EliminatedOption D: "The major app-store platforms did not coordinate their policy changes with one another". This option is irrelevant in answering the question as it is talking about whether the major app stores coordinated their policy or not, which is not the part of the passage because in the question we are concerned about the independent app market.
EliminatedOption E: "Some users continue to prefer downloading apps through official app stores, even after the policy changes". This option is also irrelevant as it talking about from where some of the users prefer to download the apps they use. The question is not asking from where does some people prefer to download the apps, the question talks about the malicious apps downloaded from the independent app market which is not mentioned in this option.
EliminatedSo from here we can easy say that only option A weakens the passage, on the other hand rest of the options either strengthen the passage or are irrelevant to the passage. That's why Option A is our answer. Bunuel
Some industry commentators argue that the recent surge in malicious mobile apps found on independent app marketplaces is the result of new restrictions imposed by the major app-store platforms. Yet none of the developers removed from the major platforms, the commentators’ alleged culprits, has released a new app on those alternative marketplaces.
Which of the following, if true, most seriously weakens the argument made in the editorial?
(A) Many of the malicious apps found on independent marketplaces resemble legitimate apps removed from major platforms and are offered by unrelated developers.
(B) Historically, the independent marketplaces have had far fewer resources to detect and remove malicious apps than major app-store platforms do.
(C) Shortly after the policy changes were announced, several new developer groups began targeting independent marketplaces to distribute apps with fewer compliance checks.
(D) The major app-store platforms did not coordinate their policy changes with one another.
(E) Some users continue to prefer downloading apps through official app stores, even after the policy changes.