How do dying stars contribute to the formation of new stars?
a. the light elements they expel form new nebulae
b. their core is absorbed by neighboring nebulae.
c. their radiation facilitates nuclear fusion in young stars
d. they transform into a gravitational field that attracts hydrogen.

Dying stars contribute to the formation of new stars by facilitating their radiation to nuclear fusion in young stars

Option C

Explanation:

New stars are formed from the old stars when the upper layers of the core expand and leave some material which gets accumulated surrounding the dying star and this in turn leads to the creation of the new star from the star dust (star dust is the elements that are ejected from the older star) that is spread across the space.

From there, the radiation of the dying stars facilitates the nuclear fusion in young stars. The core of the older star gets suppresses by the weight of the gravity and the rest of the elements lead to the formation of the new star.