Multiple point perspective is a system of perspective in which a.
there are a number of vanishing points, usually created by multiple objects.
b.
there are two vanishing points.
c.
all lines within the picture lead to a single vanishing point.
d.
all the sides are measured full size and scaled with the drawing at 30° to the horizontal.

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.

Need the reasons to solve 

Idon’t believe there is a option for that best of luck though