The correct option is B Tubectomy
The method of sterilisation is tubectomy, an internal surgical process conducted on a female. Tubectomy involves the cutting and ligating of the fallopian tubes (tubal ligation) to ensure that the released ovum is prevented from travelling down through the tube. Conversely, it also makes sure that the released sperms are prevented from swimming upstream to meet up the ovum and complete fertilisation post-coitus. Though this method involves a surgical procedure, the flip side is that this kind of sterilisation is not only most effective, freeing the female of any concern of future unwanted pregnancies, she is also relieved of taking oral pills which disrupts her hormonal balance causing nausea and perpetuating other undesirable side –effects. Even better is that this procedure is reversible wherein the passage of the fallopian tube can be re-sutured by a surgeon to restore its original form and allow free passage of the ovum as before thereby helping in the desired conception. However, this procedure does not give protection against the transmission of STDs.
While condoms, IUDs and diaphragm do not include surgical procedures. However, these are temporary ways to keep the time gap between two children. Further, it is not fully effective. Chance pregnancies can take place due to method failure.