The correct option is C Sterilisation techniques
MTP :
MTP ( medical termination of pregnancy) helps in legal and intentional termination of pregnancy before full term. It can be practiced only by registered medical practitioners to prevent illegal female foeticide.
It is not the method of birth control because birth control methods prevent pregnancy while MTP is performed after pregnancy has occurred.
Surgical methods :
Surgical methods involve sterilization of male or female partners and used as the terminal methods to prevent pregnancies.
Sterilization techniques include vasectomy in males (vas deferens is cut and tied up) and tubectomy in females (fallopian tube is cut and tied up).
It is one of the safest methods of contraception.
Rhythm method :
Rhythm method (periodic abstinence) is a natural contraceptive method which is working on the principle of avoiding chances of meeting ovum and sperms.
In this method the female, abstain from sex during the most fertile days of the menstrual cycle.
This method has high chances of failure because ovulation can vary from time to time depending upon the lifestyle, stress, environment and physiology of the body.
Barrier methods :
Barrier contraceptive methods prevent the physical meeting of sperm and ovum. Examples include condoms, diaphragms etc.
This method is not safe and has chances of failure.
Final answer :
b.) Sterilisation techniques