Reverberation bounces once and echo bounces a number of times

In what meter is this excerpt?

a. two- or four beat b. three beat c. neither two- or four beat nor three beat

This composer, the illegitimate son of a single woman and a priest, eventually became a trusted friend of the major rulers of the day, including the dukes of Burgundy and Savoy, the pope, and even the Medici, who called him "the chief ornament of our age."

A) Gilles Binchois B) Johannes Ockeghem C) Guillaume Dufay D) Antoine Busnoys