Q: What process, which results because of great pressure at the center of a star, causes stars to shine?


Read this paragraph and choose the correct option from the provided answers:

Stars shine because of nuclear fusion. Fusion reactions in the Sun's core keep our nearest star burning. Stars are made mostly of hydrogen and helium. Both are very lightweight gases. A star contains so much hydrogen and helium that the weight of these gases is enormous. The pressure at the center of a star is great enough to heat the gases. This causes nuclear fusion reactions.

 Choices:

- gravitational pull

- electric fusion

- energy fusion

- nuclear fusion


A:
nuclear fusion