When does a protostar become a true star?
A) when nuclear fusion begins in the core
B) when the central temperature reaches 1 million Kelvin
C) when the thermal energy becomes trapped in the center
D) when the stellar winds and jets blow away the surrounding material
E) when the star is 1 million years old
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A) when nuclear fusion begins in the core
To be more precise: when hydrogen fusion begins in the core the protostar becomes a main sequence star. There is a very short fusion stage before that where the tiny quantity of deuterium present is fused. This is theorized to be the energy source of Jupiter, as that planet radiates three times as much then it receives from the Sun.
"E" yeah "E" so it is.
"A" yep "A".