Which of the following risk factors is associated with ectopic pregnancy?

Pelvic inflammatory disease (PID) is a key risk factor associated with ectopic pregnancy because it often results in damage to the fallopian tubes, which can impede normal fertilization and transport of an embryo. When the tubes become scarred or blocked due to infections (such as those caused by sexually transmitted infections), a fertilized egg may get trapped in the tube rather than implanting in the uterus. This abnormal implantation leads to an ectopic pregnancy, which poses significant risks to the individual and necessitates medical attention.

High blood pressure, diabetes, and advanced maternal age are also factors that can influence various aspects of pregnancy and maternal health, but they have not been established as direct risk factors for ectopic pregnancy in the same way that PID is. While such conditions may have other implications for pregnancy outcomes, the specific link between PID and ectopic pregnancy is well-documented, making it the correct choice in this context.