A Planetary Nebula Is Created

A planetary nebula is created:

A) over several hundred years, during mass transfer in a close binary star system.
B) in seconds, during the helium flash in a low-mass star.
C) slowly over 10,000 years or more, due to thermal pulses in a low-mass star.
D) in hours or less, during the explosion of a massive star.

Correct Answer:

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