Final answer:
The true statement is A, which states that STIs are a major cause of infertility in women. Chlamydia is the most common bacterial STI and bacterial STIs are treatable with antibiotics, whereas viral STIs, including HPV, cannot be cured.
Step-by-step explanation:
The correct answer to the question is A. STIs are a major cause of infertility in women. Untreated STIs can lead to serious health issues such as pelvic inflammatory disease (PID), which can result in infertility or ectopic pregnancy. Chlamydia is the most common STI caused by bacteria in the United States, and it is particularly prevalent among teens and young adults. Conversely, viral STIs like HPV (human papillomavirus) and HSV-2 (herpes simplex virus 2) are also common, but not the most prevalent overall. Vaccines can prevent some STIs, such as HPV, which can lead to genital warts or cervical cancer, and safe sex practices can greatly reduce the transmission of STIs. It's essential to note that bacterial STIs can be cured with antibiotics, while viral STIs cannot be cured but can be managed.
Statement B is not universally true as STI rates are influenced by a range of factors, not just the social acceptance of homosexuality. Furthermore, statement C is incorrect since syphilis and hepatitis B are common but not the most prevalent STIs in the United States.