Pitch an idea for an app that would help with sustainability (examples could be recycling, food waste or energy). What features would it have, how would one of these features work and how would it positively impact the user of the app

What is a loop? a. a collection of function definitions at the top of a program b. a line of code that defines a variable and assigns it a value c. a program that opens the turtle graphics window d. a block of code that repeats a specific number of times