All the correct statements that describe Gregorian chants are;
Gregorian chant is melody set to sacred text.
Gregorian chant enhances religious services, including prayers and ritual actions.
Gregorian chant is sung without accompaniment; it is monophonic
Gregorian chant was developed in Central and Wester Europe around the 10th Century. It had a a musical texture called Monophony which is characterized by its simplicity.
Gregorian chant is also used in liturgies by the Roman Church with some of the texts taken from the Bible and others are related to specific moments of the day (like the Angelus) and as such we can say that the text is sacred. It is also sung as acappella which means that voice is the only instrument.
Thus, we cans ay that the correct statements are options A, B and C.
The missing options are;
A. Gregorian chant is melody set to sacred text.
B. Gregorian chant enhances religious services, including prayers and ritual actions.
C. Gregorian chant is sung without accompaniment; it is monophonic
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