Answer:
At the end of scene 3, dramatic irony creates suspense because the characters do not know that they will be discovered and taken to concentration camps, but the reader does.
Step-by-step explanation:
Dramatic irony is a literary resource where the writer creates a narrative with information that the reader knows what's going on or what's going to happen, while the characters don't know it.
In the case of Anne Frank's diary, in scene 3, the characters are unaware that the Nazi soldiers will arrive in hiding and take them to the concentration camps, but the reader knows and is enveloped in an atmosphere of suspense waiting for that moment to happen.