MrBegay,a 62-Year-Old Navajo Indian,has Been Admitted to a Medical Unit

Mr.Begay,a 62-year-old Navajo Indian,has been admitted to a medical unit for immunodeficiency syndrome.While his wife is visiting him,the nurse asks her additional questions for Mr.Begay's health assessment.However,Mrs.Begay does not answer the questions but just looks at her husband.Mrs.Begay does not answer the questions because

A) She does not know the answers.
B) She does not want to contradict previous information.
C) According to Navajo tradition,one should not speak for another person.
D) According to Navajo tradition,Mr.Begay is the head of the household.