It seems like you're asking about a slightly mixed-up concept. Here's the breakdown:

* Nebulae are the birthplace of stars, not the other way around. Nebulae are vast clouds of gas and dust, primarily hydrogen and helium. These clouds are the raw materials for star formation.

* Stars form within nebulae. Gravity causes the dense regions of a nebula to collapse under their own weight. As this material compresses, it heats up, eventually reaching a temperature hot enough to ignite nuclear fusion. At this point, a star is born.

So, the correct answer is that stars do not form nebulae; they form within them.