Pueden descagar musica means that you are able to download music. Pueden instalar juegos means that you are able to install games. Pueden comunicarse con mensajes instantaneos means that you are able to communicate with instant messages. None of these things you are able to do on a school computer. Therefore, your answer would be the first one.
Pueden hacer la tarea means that you can do the homework. Pueden descargar música means that you can download music. Pueden instalar juegos means that you can download games. Pueden comunicarse con mensajes instantaneos means that you can chat.
