Choose the correct statement regarding the design concepts of proportion and scale

A. There's no difference between proportion and scale; these are interchangeable terms. 

B. Proportion has to do with the sizes of the parts of an object; scale refers to the size of an object in relation to the size of other objects. 

C. An object's proportions refer to its size in relation to the size of other objects; scale refers to the object's measured dimensions. 

D. Proportion refers to the dimensions of objects that are parts of a single group; scale refers to the

AMONG THE CHOICES, MY ANSWER IS LETTER D.
Though it is incomplete, the first definition is correct.

Proportion refers to the dimensions of objects that are parts of a single group ; scale refers to the size of an object compared to the world in general or other specifically objects. 

This would be tesserae.