What does "alla breve" signify in terms of musical meter?

"Alla breve" indicates a musical meter that is equivalent to a 2/2 time signature, which features a minim (half note) as the basic beat unit. This implies that each measure contains two minims, making the rhythm feel straightforward and typically faster than common time (4/4). The choice aligns with the traditional understanding of "alla breve," often used in contexts requiring a brisk and lively tempo, such as marches or fast pieces.

The other options do not accurately define "alla breve." While "in a march style" could describe the usage context, it does not specifically address the time signature itself. Similarly, terms like "slow and steady" and "with varying dynamics" refer to aspects of tempo and expression but not to the meter defined by "alla breve." Thus, focusing on the definition of the time signature clarifies why the correct answer revolves around the specification of minim beats within the context of a 2/2 meter.