Which of these strategies would eliminate a variable in the system of equations?

What type of risk factor for underage drinking includes gang presence and income inequality

*edit* i took the test and i picked a and it was incorrect for its c! rank the following suggestions for preventing std, in order of increasing effectiveness. 1) using latex condoms properly 2) using spermicidal foam or jelly with a monogamous partner 3) abstaining from sexual intercourse and genital contact a. 1, 2, 3c. 2, 1, 3

During the sixteenth, seventeenth, and eighteenth centuries, the mentally ill were housed in