Question

problem? she immediately began sketching a design for the h₂o - scope—a telescope that could find water on distant planets.
why is the h₂o - scope important to layla and salim?
they believe it will stop jetpacks from being so loud.
they want it to make their inventions more successful.
they need it to travel to places like junkyards.
they hope it will help save their society

Explanation:

The text mentions that the $H_2O - Scope$ is a telescope to find water on distant planets. While the other options about jet - packs, making inventions successful, and travel are not related to the given description of the $H_2O - Scope$. Finding water on distant planets could potentially be crucial for saving a society that might be facing a water shortage or other related issues.

Answer:

They hope it will help save their society.