What mannerist conventions did parmigianino use in madonna with the long neck?

Answer

Parmigianino in Madonna with the Long Neck used distorted proportion and a complex composition.

Explanation

Madonna with the Long neck was prepared in the Mannerism style that came after the high renaissance painting.  The characteristic of this painting easy to notice is elongated figures that are presented with elegance and high refinement. This style exaggerates proportion, balance and ideal beauty to come up with a composition which is asymmetrical.

i think the answer could be either a or b because both are part of the post production part. hopefully this you a little.