Match the columns and select the correct option.

A. Chemical method- During sexual intercourse, chemical adhere to the mucous membrane and immobilise and kill thr sperms. Example Foam tablets, jellies, paste and cream.

B. IUDs- It prevent implantation. Example-Copper-T, Lippes loop, LNG-20.

C. Barriers- It prevent fertilization. Example- Condom, Diaphragm, cervical cap, vault.

D. Sterilization- Vasectomy in male and tubectomy in female is a permanent and sure birth control.

So, the correct answer is 'A-4, B-2, C-3, D-1'.