Human beings can exhibit complex, goal-oriented behavior without conscious awareness of what they are doing.
Conclusion (Thus)
Establishing that nonhuman animals are intelligent will not establish that they have consciousness.
Evidence
Humans can exhibit complex, goal-oriented behavior without conscious awareness of what they're doing.
Evaluate
Very confusing conclusion, so we need to think about what it's saying and what our burden of proof is, if we were trying to convince a courtroom that the conclusion is true.
"Merely establishing X will not establish Y". What's another way to say that?
"X does not prove that Y is true" "X is not sufficient to prove Y"
This conclusion is refuting a conditional. It's saying that X --/--> Y.
To refute a conditional you prove that it's possible for the trigger to be true while the outcome isn't. To prove that "knowing X does not mean you know Y", we would need an example where X is true but Y isn't.
To prove that "knowing intelligent doesn't mean you know consciousness", we would need an example where Intelligence is happening but consciousness is not.
When we look at the evidence, has the author presented a data point showing that sometimes Intelligence is present but Consciousness is not?
He presented a data point where, Complex, Goal-Oriented behavior is present but Conscious Awareness is not.
Goal
The author is treating "complex, goal-oriented behavior" as a proxy for "intelligence", so he must be assuming that this complex, goal-oriented behavior is intelligent behavior.
If we felt very lost on this problem, we could guess that the correct answer will talk about "intelligent", because that's a New Term in the Conclusion.
And because "consciousness / conscious awareness" is mentioned twice, we don't need to be looking for that idea in the answer. We need to link "intelligent" to whatever idea is linked to "conscious awareness".