Etymology 1 (chai)
Borrowing from Hindi चाय (chai).
chai (n class, plural chai)
From Arabic قَهْوَة (qahwa).
kahawa (n class, no plural)
1) coffee (drink)
This is strange as a question. I could understand somebody asking "Tea or coffee?" if they are offering the person a drink, but you normally wouldn't offer both together.
Mambo rafiki! I think many exercises are just to practice the Swahili grammar or translations. There is no context here. Still, there are a few sentences, and greetings that can be used in conversations. :)