It keeps saying this while I program, "Sprite is defined, but not called in your program." What does that mean, I need a simple answer, I'm still new to coding. Thanks

Two students are discussing electricity that has a frequency of 60 hz. student a says that this type of electricity is referred to as ac. student b says that in this type of electricity, the electrons flow in only one direction. which of the following statements is correct? a. only student a is correct b. only student b is correct c. both of the two students are correct d. neither of the two students is correct