This is a question with answer options. Goal: How do I know how much salt to add to the boiling water?

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS: a. When cooking noodles the water should be salted to resemble the taste of seawater in order to impart flavor to the noodles.. b. When cooking noodles the flour should be salted to resemble the taste of seawater in order to impart flavor to the noodles.....I think the answer is
a.