I figured since there is no explanation video on this one, I'd offer my two cents. Please feel free to respond if my explanation is lacking anything or if you have a better one.
So the correct AC is B and here is why. The stimulus tells us that essentially that scientists relying on social reasons like prestige is not actually a bad thing when they are accepting arguments because social reasons are used to influence every human endeavor. The reason why this is the flaw is because it essentially relies on the fact that this justification is used so often as a valid reason to justify this claim. We know this because social reasons are stated to influence every human behavior, highlighting the frequency of use. The principle behind this argument is "if a justification is used frequently then the justification is valid. But obviously this is not true, just because a justification is used frequently it doesn't mean it is at all a valid way of supporting the argument. I mean we can even use real life examples to really highlight how wrong this claim is. Human emotions also influence every human endeavor, does that mean scientists are justified in accepting scientific arguments based on human emotions and is it right that doing so isn't detrimental? Of course not, doing so would lead to so many biases and flawed groundless conclusions.
I'll also disprove C because it seems to be a popular AC. The reason why this is not the correct AC is because it is not the flaw. This AC is saying that the argument does not consider the fact that these scientists in addition to relying on social reasons also consider relevant evidence when accepting these claims. This actually sounds like it is strengthening the argument. Now we have evidence that these scientists are not just blindly accepting arguments based on social reasons and that there is actually some actual definitive evidence behind these justifications.
This is how I explained this question to myself, I'm curious to know your thoughts.
The reason why AC A is right is because "environment" is counted as part of society (AKA a subset). So now that we know that if we harm the environment, we also hurt society, we can actually conclude that sound resource management requires us to reflect unintended harm to the environment. It's analogous to me saying, "If I hurt your arm, I hurt you." I'm sure you'd agree, considering your arm is part of you. With this premise, I can conclude that in order to look after one's overall wellbeing, you must also consider the well being of your limbs.
Since we already established that sound resource management requires reflecting the unintended harm brought to society. Also, since AC A claims that the environment is part of society, by reflecting the unintended harmful effects on the environment, we are also considering its harm to society.