Refined Mills Orders "Grade A" Oats from Sweet Valley Farm

Refined Mills orders "Grade A" oats from Sweet Valley Farm to grind and sell to Town Co-op Grocery. Sweet Valley ships "Grade B" grain, which Refined Mills accepts. To recover damages for the nonconformity, Refined Mills must give notice of the breach within a reasonable time to​

A) ​Sweet Valley.
B) ​Town Co-op.
C) ​no one.
D) ​the appropriate state government agency.