Which term best describes plainchant music? polyphonic instrumental secular monophonic

The best description of plainchant music is:

-Secular.

Explanation:

The term plainchant (plain song) designates the traditional vocal music of the Christian liturgies, which is official of the Roman rite. This is essentially monodic, that is, it consists of a single melodic line, and is usually sung a capella. It is articulated by a free rhythm, which is essential according to any old treatise that deals with respect.

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that is true. stravinsky's rite of spring ballet is a prime example of with its focus on prehistoric culture, costumes, and dancing.