In the medieval period, one example of music was…

a. plainsong chant
b. secular polyphony
c. stringed quartets

d. congregational hymns

Congregational Hymns

Explanation: Plainsong also known as Gregorian Chants are derived from Congregational Hymns, stringed quartets don't come in until like the 14th century, and Secular Polyphonies are a product of the Rennaisance.

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