To determine which sentence uses the word 'apprise' correctly, let's first understand the meaning and standard usage of the word 'apprise'. The word 'apprise' means to inform or notify someone about something. Therefore, it is used when someone is being made aware of information or a situation, generally about something ongoing or about to happen.
Now, let's evaluate each option:
Therefore, the correct answer is: "The assistant will apprise the director of the situation." This sentence accurately uses 'apprise' to convey the act of informing someone.