Final answer:
The number of Wyndham Vacation Ownership's owners' families is substantial, estimated to be between 750,000 and 1 million, based on the available answer options. However, for the most accurate and recent information, one should refer to Wyndham's latest reports.
Step-by-step explanation:
The question asks about the number of owners' families associated with Wyndham Vacation Ownership. The correct answer with the most recent data available as of my knowledge cut-off in 2023 is either B) 750,000 or C) 1 million. It is important to note that the number of owners' families may have changed as the company grows or consolidates its ownership. To get the most recent figures, one should consult the latest company reports or official statistics released by Wyndham Vacation Ownership.