An Adolescent Girl Has Chosen Depo-Provera as a Contraceptive Method

An adolescent girl has chosen Depo-Provera as a contraceptive method and tells the primary care NP that she likes the fact that she won't have to deal with pills or periods.The primary care NP should tell her that she:

A) should consider another form of contraception after 1 year.
B) may have irregular bleeding, especially in the first month or so.
C) will need to take calcium and vitamin D every day while using this method.
D) will have to take oral contraceptive pills in addition to Depo-Provera when she takes antibiotics.