How do low mass stars become white dwarfs?

Explanation:

Because the core is out of fuel, the white dwarf will eventually cool to a black dwarf. ... This will take many billions of years to cool. Degenerate gas pressure inside the core continues to support the star so it doesn't collapse.

because the core is out of fuel, the white dwarf will eventually cool to a black dwarf this will take many billions of year to cool . degenerate gas pressure inside the core continuous to support the star so it doesn't collapse

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.