Which condition could make an IUD unsuitable for a woman?

A history of pelvic inflammatory disease (PID) can make an intrauterine device (IUD) unsuitable for a woman due to the increased risk of complications. PID is an infection of the reproductive organs, often caused by sexually transmitted infections. The presence of PID can lead to scarring and other changes in the reproductive system, which may increase the risk of complications, such as the potential for expulsion or difficulty during insertion of the IUD. Additionally, women with a history of PID may have an elevated risk of future infections or adverse outcomes if an IUD is placed. This clinical history necessitates careful evaluation and consideration, making the use of an IUD potentially inappropriate in such cases.

For the other choices, the desire for long-term contraception aligns well with the effectiveness and longevity of an IUD, which is designed for extended use. Future plans to conceive do not make an IUD unsuitable; instead, women may opt for removal when they decide to become pregnant. Finally, having stable menstrual cycles does not negatively impact the suitability of an IUD, as its ability to manage menstrual flow can even be a benefit for some women. Thus, option A stands out as the condition that could render the use of an IUD inappropriate.