Select the most appropriate option to fill in the blank.

______ Paul and Jenny are waiting for you in their office.

Both

The most appropriate option to fill in the blank is Both.

The word both means two things or people considered together. In this case, the sentence is saying that both Paul and Jenny are waiting for you in their office. This means that both Paul and Jenny are present in their office and are waiting for you.

The other options are not correct.

• Any means one or more of a group of people or things. It does not make sense in this context because it is not clear which one of Paul and Jenny is waiting for you.
• Either means one or the other of two people or things. It does not make sense in this context because it is clear that both Paul and Jenny are waiting for you.
• All means the whole of a group of people or things. It does not make sense in this context because there are only two people waiting for you, not all of them.