I recommend a wireless USB mouse keyboard combo. The USB accessory does not need to come with a receiver because the Raspberry Pi 3 has Bluetooth onboard. This particular combo has one but was chosen because it is affordable and in this class a USB port can be spared for it.
The EzConnect is a perfect option for making lasting connections to your RPi's GPIO pins without needing to know how to solder. This is an optional piece because you can plug components onto the board's pins without the breakout board.
Share a photo of your finished project with the class!
Nice work! You've completed the class project