Question

in order to recreate the process of energy production that takes place in the sun, scientists use
hydrogen gas and add heat and pressure.
helium gas and remove heat and pressure.
hydrogen gas, add heat, and remove pressure.
helium gas, remove heat, and add pressure.

Explanation:

The Sun's energy comes from nuclear fusion, where hydrogen atoms fuse into helium under extreme heat and pressure. To replicate this, scientists use hydrogen gas and apply high heat and pressure to trigger the fusion reaction.

Answer:

hydrogen gas and add heat and pressure.