MakeCode program project help

Hi, I have a project to do for my university study. I have an Express microcontroller and the following MakeCode program was given to us with a couple of questions.

Which inputs and outputs of the express is used in the program?

In the program, which variable determines the output?

What does the program do?

In a couple of sentences describe how the program works?

Is there anybody who could help me with this?

Here is the program: