Answer:
Correct answer is A.) She is attending a Catholic Mass.
Step-by-step explanation:
A is the correct answer as it refers to a hymn that was used both in Eastern and Western church, so Francine would attend a Catholic Mass in this case.
B is not correct because Sanctus wasn't used in plays.
C is not correct as Sanctus was used in churches, not on courts.
D is also not correct as no dance is including during Sanctus.