Finding of a survey of patients at County Hospital: Forty percent of all complaints lodged by patients in response to inattentive staff this year were lodged by patients over age fifty.

Results of a search of County Hospital's records from this year: Most of the complaints lodged in response to inattentive staff were lodged by people over age fifty.

For both of the findings to be accurate, which of the following must be true?

A
More patients at County Hospital who have never lodged complaints in response to inattentive staff are age fifty or under than are over age fifty.
B
The percentage of patients at County Hospital that are over age fifty is considerably lower now than it was last year.
C
Most complaints lodged in response to inattentive staff at County Hospital this year were lodged by patients age fifty or under.
D
This year, complaints lodged by patients over age fifty were more serious on average than those lodged by patients under age fifty.
E
This year many people who lodged complaints in response to inattentive staff at County Hospital were not patients at the hospital.