Ruiz Agrees to Act as Seth's Agent to Sell Seth's

Ruiz agrees to act as Seth's agent to sell Seth's farm while Seth is away from the property. A contract for a sale of real estate must be in writing. The agreement between Ruiz and Seth

A) can be implied.
B) must be in writing.
C) may be oral or in writing.
D) should be ratified, affirmed, or authorized orally.