F and J. Those are our experienced astronauts. We need one inexperienced radiobiologist and one inexperienced geologist. And we need P, because we don’t have L.
So that means we need P (geologist) and therefore N as well (radiobiologist). D is CORRECT.
We can’t choose K (answer A) because we already have two experienced astronauts. Same for L (answer B). M can’t be selected, because P has to be the inexperienced geologist since we don’t have L (answer C). Same for T (Answer E).
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