The correct answer is "Both states were led by planters with an economic interest in slavery."
Maryland was one of the border states between the Union and the Confederacy. Due to its location, its citizens were subject to constant efforts from both the Confederacy and the Union to shift their opinion towards their cause. In comparison to the other states in the Confederacy, Maryland was not highly supportive of the secession. However, as a slaveholding state, it opposed abolitionism and therefore sided with this group just like Florida.