Concept:Contraceptives help prevent unintended pregnancy.Explanation:Access to contraceptives gives adolescents the means to protect themselves against unplanned pregnancy. Using contraceptives correctly does not increase the risk of sexually transmitted infections; rather, condoms help reduce that risk. There is no direct evidence that access alone promotes early sexual activity. Therefore, the main positive impact is a reduction in the likelihood of unintended pregnancies.Answer:C. reduces the likelihood of unintended pregnancies.