Formal balance is
a.
the linear symmetry of an images, so that two halves are mirror images of each other.
b.
the aesthetics and stability of an object or structure.
c.
the arrangement of the elements so that no one part overpowers or seems heavier.
d.
the pleasing composition of parts or objects.

Formal balance is

a.

the linear symmetry of an images, so that two halves are mirror images of each other.

satin. 

"very shiny satin may look great in the fabric store or in the sewing room, but once onstage it can look fake and cheap as it reflects the light from the fixtures."

your answer would be d.)