Critics have argued that because Freudianism holds that people have unconscious desires that can defeat their attempts to follow rational life plans, it is incompatible with the predominantly rationalistic spirit of Western philosophical and psychological thought.
Attribution (critics argued)
Freudianism is incompatible with rationalistic Western thought, because it holds that people's unconscious desires can defeat their rational life plans.
Author's Pivot (But)
Freudianism also says that you can become conscious of these unconscious desires and avoid being defeated by them.
Evaluate
Since the blank is prefaced by Therefore, we know that we're trying to pick whichever answer feels like the Most Supported conclusion.
if we read this paragraph as a regular Most Supported stimulus (where we read mostly for Causal, Conditional, or Pivot wording), the But introducing the final claim would get our attention.
Most of the time that an Inference paragraph Ends with a Pivot, it means that the correct answer will be the takeaway you get from combining this final claim with what came before it.
When we see an Attribution followed by a Pivot, then the takeaway is usually, "The original attribution was wrong" (a rebuttal).
The critics' conclusion was that Freudianism is not compatible with Western rationalism, based on the premise that Freudianism talks about unconscious desires defeating our rational plan. The author is saying, 'Yeah, but you can learn to avoid being defeated by those unconscious desires."
This suggests that rationality can still win. You can still follow your rational life plan, so long as you learn to be conscious of these unconscious desires.
Goal
Thus, we'd logically arrive at a Rebuttal conclusion: these critics are wrong to think that Freudianism can't co-exist with Rationalism. Freudianism is compatible with the rationalistic spirit of Western thought.