It was important to the allies for Operation Overlord to succeed to prevent them being used as bases for the subversion of their often tenuous authority in their own colonies.
<h3>What is Subversion?</h3>
This is defined as the act of trying to destroy or damage an established system or government.
'The Allies needed to reach Berlin, Germany' was the evidence from the text which was why it was chosen as the most appropriate choice.
