Which reason could explain this unexpected behavior?

A User forgot to store an Additional Discount at the Quote level while they were in the Line Editor. Rather than going back in, they have changed the field on the Quote’s detail page. After doing so, however, no prices were updated to reflect the new discount.

Which reason could explain this unexpected behavior?
A . The Additional Discount is only applied to the Amount fields on the Quote.
B . Fields updated outside of the Line Editor do not affect Pricing.
C . The Additional Discount field is not in the Calculating Fields field set.
D . A Price Rule is needed to inject this value into the Quote Lines.

Answer: D