Rumpel Lawn Care Inc

Rumpel Lawn Care Inc.has had contractual relations with Rudy for many years.Rudy left a message asking Rumpel to include an organic weed inhibitor in the next lawn dressing mix applied to his lawn and to just add the whatever charge there would be to his regular bill.Which of the following would you expect a risk manager is likely to advise Rumpel in this regard?

A) to negotiate the interest rate at the time business is transacted
B) that a court would imply a term requiring payment of the new sum
C) that a court will automatically impose a common law implied term of good faith
D) to clarify the contractual relationship each time business is transacted