Which of the following methods, by which human conception can be postponed, is the least invasive? a. The rhythm method
b. The vaginal ring
c. Oral contraceptives
d. Tubal ligation
e. Vasectomy

The correct answer is: The rhythm method.

Explanation:

The Rhythm method is the least invasive contraceptive method because it only involves shifts in sexual behavior. The other methods listed here require at least and object being introduced to the organism or some sort of surgery. Therefore, the Rhythm method is minimally invasive because it involves adjustment to the natural body cycles.

In conclusion, the correct answer is: a.

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