Critch - In the question as you have quoted it the actual numbers are not relevant. Minima change from airfield to airfield and runway to runway, depending on what aids are being used. In this question the minima are whatever have been briefed.
If the captain, be he moody or the biggest joker in the company elects to go below minima you tell him he is breaking the law, if he actually goes below the pre briefed minima you should say, in a loud voice, "Go Around", - when you get on the ground you should file a report immediately so that the Data and voice recorders can be pulled.