Leilani Enters into a Contract with Metro Taxi Company to Work

Multiple Choice

Leilani enters into a contract with Metro Taxi Company to work as a cabdriver.Under the plain meaning rule,if the contract's writing is clear and unequivocal,the meaning of the terms must be determined from​ 

A)  ​only evidence not contained in the document. 
B)  ​any relevant extrinsic evidence. 
C)  ​only the document itself. 
D)  ​the later testimony of the parties.