Which person reenlisted in WWII and was a vocal advocate for Conscription?

Conn Smythe is the correct choice as he was a prominent figure in hockey who played an active role in advocating for conscription during World War II. Smythe, known for his leadership with the Toronto Maple Leafs as both a player and later as an owner and general manager, utilized his influence to promote the necessity of conscription to support the war effort. His advocacy stemmed from a strong sense of duty and commitment to Canada during a pivotal time in history.

In contrast, Maurice Richard, Wayne Gretzky, and Bobby Orr are renowned for their contributions to hockey but did not hold the same level of public political advocacy regarding conscription during WWII. Richard had a significant impact on the game and became a cultural icon, but his primary focus remained on hockey. Gretzky and Orr, while both legendary players, came after the war period and were not involved in conscription discussions related to that time.