Choose the option which best expresses the meaning of the idiom/phrase in bold in the sentence.
Despite their differences, the two business rivals decided to let bygones be bygones and work together.

The idiom "let bygones be bygones" means to forgive past issues and move forward without holding grudges. It suggests putting aside old disputes in order to restore peace or cooperation.Option 1 ("To let the past grievances remain in memory") contradicts the idiom’s meaning, as it implies dwelling on past issues.Option 2 ("To keep reminding each other of past mistakes") is the opposite of the idiom’s intent, which is about moving on.Option 3 ("To compete more aggressively than before") does not match the meaning, as the phrase implies reconciliation, not rivalry.Thus, Option 4 is the most appropriate choice.