Lorena Is Appointed as an Agent for Milled Grains, Inc

Lorena is appointed as an agent for Milled Grains, Inc. The agency agreement is silent as to the level of sales that Lorena is expected to achieve. She must​

A) ​achieve nothing because the agreement says nothing on the issue.
B) ​attain the level that Lorena achieved with her previous employer.
C) ​maintain the level Milled Grains attained before Lorena became an agent.
D) ​use reasonable diligence and skill in selling.