As is used in paragraph 4, the phrase "a control group" refers to______.A.people working a
As is used in paragraph 4, the phrase "a control group" refers to______.
A.people working at the Oregon Department of Health
B.people investigating at the Multnomah County Health Department in Oregon
C.people serving as a standard of comparison for checking test results
D.people involved in passing legislation banning smoking in eating establishments