Given below ar four methods (a-d) and their modes of action (i-iv) in achieving contraception. Select their correct mathing from the four options that follow.
`{:("Method",,"Mode of Action"),("(a) The pill",," (i) Prevents sperms reaching cervix"),("(b) Condom",,"(ii) Prevents implantation"),("(c) Vasectomy",,"(iii) Prevents ovulation"),("(d) Copper-T",,"(iv) Semen contains no sperm"):}`

Options

A. a-iii,b-iv,c-`i`,d-ii
B. a-ii,b-`i`,c-iii,d-iv
C. a-iii,b-`i`,c-iv,d-ii
D. a-iv,b-`i`,c-ii,d-iii

Answer

To solve the question, we need to match the contraceptive methods (a-d) with their respective modes of action (i-iv). Let’s go through each method step by step.

### Step 1: Identify the Methods and Their Actions
1. **The Pill (a)**: This is an oral contraceptive that primarily works by preventing ovulation.
2. **Condom (b)**: This is a barrier method that prevents sperm from reaching the cervix.
3. **Vasectomy (c)**: This is a surgical procedure that cuts and ties the vas deferens, resulting in semen that contains no sperm.
4. **Copper-T (d)**: This is an intrauterine device (IUD) that prevents implantation of the fertilized egg.

### Step 2: Match Each Method with Its Mode of Action
- **(a) The Pill** matches with **(iii) Prevents ovulation**.
- **(b) Condom** matches with **(i) Prevents sperms reaching cervix**.
- **(c) Vasectomy** matches with **(iv) Semen contains no sperm**.
- **(d) Copper-T** matches with **(ii) Prevents implantation**.

### Step 3: Final Matching
Now we can summarize the matches:
- (a) The Pill → (iii) Prevents ovulation
- (b) Condom → (i) Prevents sperms reaching cervix
- (c) Vasectomy → (iv) Semen contains no sperm
- (d) Copper-T → (ii) Prevents implantation

### Conclusion
The correct matching of methods and modes of action is:
- A - iii
- B - i
- C - iv
- D - ii