It is false that an entente is a formal agreement between nations in their common interests.
Answer: Option B
Step-by-step explanation:
An entente is an agreement that has been made between states which is made keeping in regard their common interests. But this agreement is not a formal agreement between the nations rather it is an informal agreement. It gives a casual and a friendly understanding of the states.
But is formed for the benefits of all the nations or the states who are a part of this entente and does not favor the terms of only one nation which is a part of the alliance.