Question

which detail shows that kamens light - controlled systems were very good?
kamen was introduced to a man who sold audio - visual equipment for big light and music shows.
when he was sixteen, kamen spent all summer building high - powered light - controlled systems.
one of his inventions was used in theaters, the museum of natural history, and the new york planetarium.
to make one of his devices, he bought every kind of electrical equipment that he could find.

Explanation:

If an invention is used in multiple significant places like theaters, a museum, and a planetarium, it implies that it is of high quality and good enough to be utilized in such diverse and notable settings. The first option is just about an introduction, the second is about the time spent building (not directly showing quality), and the fourth is about buying equipment (also not directly showing the system's goodness).

Answer:

One of his inventions was used in theaters, the Museum of Natural History, and the New York Planetarium.