The best way to combine the sentences is:
"Shields inputs information about a planet's atmospheric makeup into the model to figure out what the temperature on the planet's surface would be."
This combines the ideas smoothly and clearly indicates the purpose of the action. However, none of the provided answer choices exactly match this option. Among the given choices, the closest would be:
model to figure
This option suggests that her action of inputting information into the model is intended to help her figure out the surface temperature, but it does sacrifice some clarity and grammatical accuracy compared to the more natural phrasing.