Hi, Howard,
You're right that "tend to" does not imply causality, and that's the whole problem with this argument. The premises of the argument describe phenomena that "tend" to go together:
- Risk taking tends to go with less ethical behavior.
- Desiring social acceptance tends to go with more ethical behavior.
These are phenomena that are correlated with one another. The problem crops up when the author attempts to make a causal conclusion from these correlated phenomena. The author concludes:
- Business schools can promote ethical behavior by teaching less risk taking and more social acceptance.
Here the author assumes, without providing justification, that the risk taking and desiring social acceptance are causally related to ethical behavior. That's where the flaw in the reasoning is.
Thus, the author neither assumes that risk taking is
always associated with less ethical behavior nor does he assume that desiring social acceptance is
always associated with more ethical behavior.
In both the premises and the conclusion we talk about tendencies, "tends to" and "promote." For this reason answer choice A is not a great match for our argument. Answer choice C captures the mistaken cause and effect flaw that we have here.
Good analysis here. I hope this helps.