Final answer:
Professor Plum is blocking the study door and declares it 'Occupied', meaning he is denying access to the study. The correct answer is option 'b) Professor Plum denies access to the study'.
Step-by-step explanation:
The student's question involves interpreting a scenario described in a script or text, which pertains to the subject of English. In the given scenario, Professor Plum is blocking the study door and declares it 'Occupied'. This indicates that Professor Plum is denying access to the study. Therefore, the correct answer to the question is 'b) Professor Plum denies access to the study'.
This activity is likely part of a lesson in reading comprehension or drama, where students are asked to understand the actions and intentions of characters within a text. The phrasing 'Occupied' commonly means that a space is in use and not available for others to enter.