What does mensuration indicate in early music notation?

a: rhythm
b: pitch
c: key signature
d: time signature

i think it's either a or b

The answer is A. Rhythm. 

Mensural notation is the musical notation system used for European vocal polyphonic music from the later part of the 13th century until about 1600. The term "mensural" refers to the ability of this system to describe precisely measured rhythmic durations in terms of numerical proportions between note values.

Answer: (d) all the aboveexplanation:

the above mentioned statements talks about the creativity of an artist and to what extend they can utilize and experiment on the objects provided.   differing size and subjects are given so that an image of wisdom is created. displaying a transition from light to dark in something by darkening sections in order to create a shadow. and lastly, putting bits and pieces together to formulate a new image.

Ibelieve the answer is the second one. plz don't kill me if i got it wrong. > .<