Answer: If his plan is going to work.
Explanation: Clearly Jack is using STEM for his plan so making sure that his plan works could possibly be the answer. I mean if you were creating a project you would want to make sure that it works and that you checked your STEM skills to go forward with the plan.
The first one has the correct capitilization.
"<span>Death Valley, the lowest point in the United States and part of the Mojave Desert, is located in Southern California" is the proper choice. "Southern" in Southern California is capitalized because it's named a distinct region. </span>
