If the sunflower seeds were modified and labeled as reduced sodium, this would mean that the reduced product has % less sodium than the original product:

25%

Explanation:

The correct answer to the given question is 25%

A sunflower seed contains 9mg of sodium in it which can be modified and reduced as per needs.

If seed of a sunflower is modified and labeled as reduced sodium than this means that the sodium in the seed of a sunflower is reduced by 25% as compared to the original seed of sunflower in which no changing was made.