What is the signature fundraising activity of AOII related to baseball?

The correct answer is "Strike Out Arthritis." This fundraising initiative is specifically linked to AOII's commitment to supporting arthritis research and education. The event typically involves baseball games or activities that serve as community engagement opportunities while raising awareness and funds for the cause. AOII's national philanthropy focuses on arthritis, and through "Strike Out Arthritis," members and supporters gather to promote the importance of research and provide community support for those affected by arthritis.

While the other options may seem related to sports or philanthropy, they do not represent the specific signature fundraising activity associated with AOII. "Strike Out Cancer" and "Home Run For A Cause" may involve collaborative efforts with other organizations or causes, but they are not uniquely connected to AOII’s mission. "Baseball Bash" could refer to a fun event, but it lacks the direct correlation with AOII's specific philanthropic focus on arthritis. Therefore, "Strike Out Arthritis" stands out as the defining fundraising activity of AOII in relation to baseball.