When testing those claiming to be able to see auras around people's heads, magician james randi issued this challenge: "then if i were to step behind a wall barely taller than i am, you could determine my location from the aura visible above my head, right? " this way of challenging claims shows randi's approach?

I believe the answer is: Empirical approach

Empirical approach is a way to obtain knowledge by conducting direct or indirect observation towards the data that is relevant to the knowledge. This usually include dependent and independent variables within a research in order to find a causal relationship that might explain a certain event/phenomenon.

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i truly dont know the answer wait i do its 1,3,4