Which of these mechanisms is NOT a common way in which star formation is triggered or started?

Question

Quizplus · Accepted Answer

Heating of an interstellar cloud by radiation from embedded young stars is more likely to inhibit star formation by increasing the internal pressure and temperature of the cloud, making it harder for the cloud to collapse under its own gravity, which is necessary for star formation. The other options (A, C, D) are recognized mechanisms that can trigger or start star formation by compressing the gas and dust in interstellar clouds, increasing the density and making conditions more favorable for the gravitational collapse that leads to star formation.

Which of These Mechanisms Is NOT a Common Way in Which