I'm the diary of Anne Frank which theme is most supported by Mr. Kramer and Miep's gesture of bringing the cake to the annex on New Year's Day?

The theme presented at this time is that the violence of war can unleash kindness among people.

Explanation:

"The diary of Anne Frank" is the book written by Anne Frank, a Jewish girl who needed to be hidden for three years, along with her family and other Jews, during the second world war. The purpose of this hideout was to prevent the Nazis from finding the Frank family and sending them to the Nazi concentration camps.

The Franks had non-Jewish friends who helped them, bringing them groceries, keeping them company and bringing news about the war. Among these friends were Mr. Kramer and Miep. On New Year's Day, they brought a cake so the Frank family could celebrate and to encourage hope between them. This moment is very important in the book and shows how kindness between people can be fostered during the violent moments of war.