Gregorian chant is named after pope gregory i who composed all of the known gregorian chants. had his name put on the first printed edition of the gregorian chant hymnal. was credited by medieval legend with having created it, even though it evolved over centuries. wrote the harmonies and instrumental parts for all of the chants.

This part is true:

had his name put on the first printed edition of the Gregorian Chant hymnal. was credited by medieval legend with having created it, even though it evolved over centuries.

Explanation:

the truth, that she cannot go at the moment.

explanation:

tell her that there aren't any tickets, but maybe at some point you guys could go on a road trip to the nearest city with them and see it there.

i think a and b is the answer