Question

Imagine you are giving a speech about launching model rockets to a middle-school science class. You want to use an interview as supporting material. Which of the following people would be the best to consult?

an aerospace engineer for the military
a space camp instructor who teaches kids to build model rockets
a NASA astronaut who flew on the space shuttle
a student who has built a model rocket

Answer 1

It would have to be "A space camp instructor who teaches kids to build model rockets" would be the most reliable answer for your current situation.
If you were to ask an aerospace engineer sure they would most likely have way more info on rockets but your building a model and option b would be the most reasonable answer
if you were to talk to a ASTRONAUT then you would be asking the wrong person sure they might know some about rockets but the know more about OPERATING real rockets/shuttles
Asking a student would be the least reliable answer. the student probably has about the same knowledge as you do with NO certifications or diploma/background knowledge on such a subject to this matter (collage ect)

Answer 2

a space camp instructor who taught kids to build model rockets because they have more knowledge on how to build it and can explain in more details on how to get it right and such