Hello there! I personally believe the answer will be:
the contents of a new textbook
The other ones seemed rather informal. Weekend plans with friends have no formality at all. As do the places to shop online for new shoes. The last one could be a candidate but it seems like something you would talk about with a friend or family member. Not so much your boss!
Hope this helped!
Answer:
i think answer is a but i am not sure but i think this is only the answer
