Explanation:

How does carbon come from stars?
Interrelation with the stars:

• Most stars except the most massive ones are eventually turned into white dwarfs. When the massive stars die, they go with a spectacular bang known as the supernova. 
• Both low-mass and massive stars eject their ashes into the surroundings before they end their lives. 
• And these ashes contain many different chemical elements, including carbon.

Ongoing debate

• It is regarding whether the carbon in the Milky Way originated from low-mass stars before they became white dwarfs, or from the winds of massive stars before they explode as supernovae.
• The new research suggests that white dwarfs may shed more light on carbon’s origin in the Milky Way.

Hence both statements are correct.