A Midwife Reviews the Result of a Client's Syphilis Serology

A midwife reviews the result of a client's syphilis serology test. The client, a G2P1 at 12 weeks' gestation, tested positive. Which of the following is the priority action of the midwife?

A) Administer a single dose of benzathine penicillin G through the intramuscular route.
B) Inform the client that she should avoid any form of sexual contact until she is treated.
C) Inform the client that drug treatment may not be effective at this time and that a cesarean section will be necessary during delivery.
D) Monitor the client for early detection of Jarisch-Herxheimer reaction.