The correct option is D help in control of polulation and STDs
Barrier methods of contraception like condoms, diaphragms, etc prevent the meeting of sperms and ovum, thus preventing fertilization.
Barrier methods have been very useful in preventing unwanted pregnancies and in control of the population growth.
In addition to this, they help in controlling the transmission of STDs (Sexually Transmitted Diseases) because they prevent the exchange of genital fluid during coitus.
Barrier methods do not interfere with the sexual drive of an individual. No contraceptive aims at preventing a female child. It is wrong to discriminate the child based on the sex.