A county in Illinois is conducting a survey to determine the mean annual income per household. The county is 427sq mi (2.65q km). Which of the following sampling methods would MOST likely result in a representative sample?

A. A stratified phone survey of 100 people that is conducted between 2:00 p.m. and 3:00 p.m.
B. A systematic survey that is sent to 100 single-family homes in the county
C. Surveys sent to ten randomly selected homes within 5mi (8km) of the county's office
D. Surveys sent to 100 randomly selected homes that are reflective of the population