Answer:
The Streaming device - elastic
An elastic good is a good whose demand falls a lot, or proportionally, if the price rises. In this case, the price of the streaming device rose by 42%, and revenue fell proportionally even more, by 59%, thus, the streaming device is a very elastic good.
Cinema ticket prices - Unit elastic
A perfectly inelastic good is a good whose demand does not respond to price changes. In this case, even if the ticke prices were lowered, demand stayed the same because revenue stayed the same.
DVDs - Inelastic
The DVDs are inelastic because even if the prices were raised, demand was not affected, and in fact, it grew. An inelastic good is a good whose demand only responds to price in a limited way.