Note: this question more properly belongs in one of the verbal folders. I'll answer here, but if you'd like to have a more in-depth discussion, then I suggest that you post more in the relevant verbal folder.
In general, strengthen questions include a conclusion in the argument (above). Inference / draw a conclusion questions do not contain a conclusion in the argument above; rather, the "conclusion" is in the answer choices below.
All of the options below refer to a "conclusion" of some type in the answers. These are all Inference / Draw a Conclusion questions. (Also, the word "infer" always means an inference / draw a conclusion. Strengthen questions will not use this word.)
1. Which one of the
following inferences is most strongly supported
by the information above?
--> The
following inferences
= in the answer choices. The answer choices are supported
by the argument above. So this is an inference / draw a conclusion question.
2. Which one of the
following inferences is most supported by the information above?
--> same reasoning as the last one. If they ever refer to the inference, argument, or conclusion being
in the answer choices
, then this is an Inference / Draw a Conclusion question.
3. If all of the statements above are true, which one of the following must be true?
4. Which one of the following can be logically inferred from the passage?
5. Which one of the following logically follows from the statements above?
--> The final piece of information chronologically = the conclusion, and that is in the answer choices.