How does lack of sleep affect risk of injury? O A. It causes distractions.
OB. It interferes with motor responses.
OC. It causes illness.
OD. It interferes with hearing.

*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