A. Urodynamic stress incontinence: This condition is characterized by the involuntary leakage of urine on effort or exertion, or on sneezing or coughing, and is a common cause of urinary incontinence in women, especially after changes in sexual activity or menopausal status. The patient's recent increase in sexual activity and history of irregular menses, suggesting potential hormonal changes, support this diagnosis.

D. Vaginal atrophy: This condition, often associated with menopause, can lead to urinary incontinence due to the weakening of the pelvic floor muscles and decreased estrogen levels affecting the urethral sphincter. The patient's irregular menses and recent onset of sexual activity after a period of abstinence could exacerbate symptoms of vaginal atrophy.
C. Urinary tract infection: While not directly related to the progressive worsening of incontinence over months, a urinary tract infection (UTI) could cause or worsen incontinence symptoms, especially if the patient experiences urgency and frequency. However, the chronic nature of the patient's symptoms makes this less likely as the primary cause.

B. Neurologic detrusor hyperreflexia: This condition, characterized by an overactive bladder due to neurological disorders, could present with urgency incontinence, as described by the patient leaking urine before reaching the bathroom. Although less common, it's crucial to consider neurologic causes, especially if there are other neurological symptoms or signs, as missing these could lead to significant morbidity.

Other rare causes might include fistulas, certain types of tumors, or genetic disorders affecting the urinary system. However, these would be less likely given the patient's presentation and history, and would typically require additional specific symptoms or findings to consider.