Answer:
The correct answer is words with friends.
Explanation:
We can obviously rule out the first and second options because if it is the right words, they should be appropriate and formal. A foreign language is not in any way consider informal, it is just different words with same meanings. When reading test conditions, you will notice that they are very clear and thorough, which leaves us with the only option left. When you are talking with your friends, usually you are not formal because you are in a environment where it doesn't matter how you talk.
Hope this helps:) Goodluck!
