Concept:
Contraceptives are grouped into various categories based on their mechanism of action, including physical barriers, intrauterine devices (IUDs), and oral hormonal pills. Understanding the specific brand names and their categories is essential.
Step 1:
Progestasert and LNG-20 are examples of Hormone-releasing IUDs. They work by constantly releasing small amounts of progestin to make the uterus unsuitable for implantation and the cervix hostile to sperms.
Match: A $\rightarrow$ III
Step 2:
Multiload 375, along with CuT and Cu7, belongs to the category of Copper-releasing IUDs. These devices release copper ions ($Cu^{++}$) in the uterus, which suppress sperm motility and their fertilizing capacity.
Match: B $\rightarrow$ IV
Step 3:
Diaphragms, cervical caps, and vaults are physical barriers made of rubber that are inserted into the female reproductive tract to cover the cervix during coitus, physically blocking the entry of sperms.
Match: C $\rightarrow$ I
Step 4:
"Saheli" is a highly effective, once-a-week oral contraceptive pill for females. It was developed in India and is notable for its non-steroidal preparation, offering high contraceptive value with very few side effects.
Match: D $\rightarrow$ II
Step 5:
Combining the verified matches gives A-III, B-IV, C-I, D-II. Looking at the choices, this corresponds exactly to Option (3).