Which would you find least objectionable?

My MC drops into the new world, meets an inhabitant and

1. They can converse just fine and no explanation for why these other worlders know English is forthcoming.
2. They can converse just fine and some highly dubious hand-waving is offered as to why the other worlders know English.
3. They can't converse and the MC spends a good deal of time learning the other worlder's language.
4. They can't converse, but Magic. And now they can understand each other.