PLEASE HELP!!!!

5. Which of the following is the main reason Gies
preserved Frank's diary?
A Gies wished to return the diary to Anne's father,
Otto, the only surviving member of the family.
B Gies knew that the diary would be of great
importance to the world and therefore decided to
preserve it.
C Gies wanted to prove to the Nazi soliders that the
Frank family would never be forgotten.
D Gies sought to return it to Anne in order to bring
her joy.