Final answer:
The correct answer is (b) iLike, which was a service for downloading and sharing music, unlike the streaming service Pandora or the social-planning service Evite.
Step-by-step explanation:
The question asks which of the applications demonstrated in class is an online service that allows users to download and share music. Among the options given, the correct choice is (b) iLike, which was a social music discovery service. Pandora (a), while it is a service related to music, allows users to stream music rather than download and share it. Evite (c) is an online invitation and social-planning service which is not related to music sharing. Thus, the only option that fits the criteria given is iLike.