The Element Helium Was First Discovered and Identified as a Separate

Multiple Choice

The element helium was first discovered and identified as a separate element

A) in natural gas originating underground, from the spectrum emitted from a flame of burning natural gas.
B) in rocks containing radioactively decaying elements such as uranium.
C) on the Sun, from the emitted spectrum from its upper atmosphere.
D) inside meteorites that had come from outer space.