Which union was founded in 1887 and is also focused on licensed deck officers?

The answer is correct because the Marine Engineers' Beneficial Association (MMP) was established in 1887 and primarily represents licensed deck officers as well as marine engineers. The MMP is dedicated to providing support, resources, and advocacy for its members, ensuring their rights and interests are protected within the maritime industry. This historical context is significant, as it highlights the longstanding commitment of the MMP to professionalism and union representation in maritime professions.

In contrast, the other unions mentioned also play crucial roles in the maritime industry but focus on different groups of maritime labor. The Seafarers International Union (SIU), for example, represents a broader spectrum of maritime workers, including unlicensed personnel. The Marine Firemen's Union (MFOW) primarily represents firemen and oilers rather than licensed deck officers, while the Inland Boatmen’s Union (IBU) focuses specifically on inland waterways and their workers, which also does not encompass the licensed deck officer category as the MMP does.