单选题 The client has a newly positive Mantoux skin test although she does not have active tuberculosis. Which medical therapy would be appropriate for her?
A. Reevaluating the client's condition every 6 months.
B. Performing a repeat skin test every 6 months.
C. Administering isoniazid for about 9 months.
D. Administering isoniazid until the skin test reverts to negative.