AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Changing the hormonal balance so that eggs are not released.
Oral contraceptive pills change the hormonal balance of the body so that eggs are not released and fertilisation cannot occur.
The source passage clearly distinguishes between different contraceptive categories: condoms = mechanical barrier (A); oral pills = hormonal (B); copper-T = uterine irritation (D). Option C is not mentioned as a contraceptive mechanism at all. Examiners expect students to recall the specific mechanism linked to oral pills, which is hormonal, not mechanical or physical.