Student or Learner
"At his option, Mark may stay at our place, go back to his place, or go somewhere else."
Is "at his option" used correctly?
In some contexts (and the use of a first name suggests that this could be such a context) it may sound a bit pompous. Commonly, in speech, it would be something like 'Mark may stay at our place, go back to his place, or go somewhere else - it's up to him/it's his choice.'