Which sentence uses correct punctuation?

Question

Many countries are making progress to solve environmental problems, however there is more to be done.

Many countries are making progress to solve environmental problems; however, there is more to be done.

Many countries are making progress to solve environmental problems, however, there is more to be done.

Many countries are making progress to solve environmental problems, however; there is more to be done.

Answer 1

The sentence "Many countries are making progress to solve environmental problems; however, there is more to be done." uses correct punctuation.