Hi folks,
The questions in the original post are indeed "evaluate" questions. If there a little confusing to you, think of them in terms of hybrid strengthen/weaken question. The correct answer choice to an evaluate question will be a question or an unknown variable for which
one possible response strengthens the argument in the stimulus, but
another possible response weakens the argument in the stimulus.
For example, if an evaluation stimulus was, "The toxic Chemical X tastes like candy, and has the potential to tempt children to consume it; we must require by law that additional chemicals be added to Chemical X to make it taste bad, to protect our children," a proper answer choice might be: "Is chemical X a household chemical common in homes with children?" If we say "Yes" to the answer choice, then the argument is strengthened--we need to take steps to protect our children. But if we say "No," then the argument falls apart: we don't need to change the taste of an industrial chemical used only in factories where children aren't allowed! Since different responses to the answer choice can alternately strengthen or weaken the stimulus, we know we have the correct answer to the evaluation questions.
I hope this helps!