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The basal body temperature method is a natural family planning technique used to track ovulation based on changes in body temperature. A woman's basal body temperature typically increases slightly after ovulation due to increased progesterone levels.

In the context of avoiding intercourse, it's crucial to identify the fertile window, which is generally considered to be the days leading up to and including ovulation. Since sperm can survive in a woman’s reproductive tract for several days, intercourse should be avoided during the days leading up to ovulation and immediately after a rise in temperature, when the chances of becoming pregnant are highest.

Choosing to avoid intercourse 2-3 days before the expected drop in temperature recognizes that this drop usually indicates the end of the luteal phase and the onset of menstruation. Similarly, avoiding intercourse for 3 days following a temperature rise helps prevent unintended pregnancy during the fertile window that can sometimes be inaccurately predicted. This approach effectively encompasses the pertinent days surrounding ovulation, ensuring the highest accuracy in avoiding conception.

Thus, the correct option accounts for both the days leading up to ovulation as well as the post-ovulation period, making it the most comprehensive choice for avoiding intercourse when using this method.