Match the following :
`{:("List - 1","List - 2"),((a) "second" ,(e) "carbon " - 12),((b) "mole", (f) "Platinum iridium "),((c) "Metre", (g) Cs- 133),((d) " Kilogram" , (h) Kr- 86):}`

Options

A. `a - e, b - g, c - h , d - f`
B. `a - f, b - h , c - g , d- e`
C. `a - e , b- f, c- h, d- g`
D. `a - g, b- e , c - h, d - f`

Answer

To solve the matching question, we need to pair the items from List 1 with the correct items from List 2 based on their definitions and uses in physics.

### Step-by-Step Solution:

1. **Identify the items in List 1:**
- (a) Second
- (b) Mole
- (c) Metre
- (d) Kilogram

2. **Identify the items in List 2:**
- (e) Carbon-12
- (f) Platinum-iridium
- (g) Cs-133 (Cesium-133)
- (h) Kr-86 (Krypton-86)

3. **Match the items:**
- **Second (a)**: The second is the fundamental unit of time. The standard for the second is based on the vibrations of Cs-133 (Cesium-133).
- **Match:** (a) → (g)

- **Mole (b)**: The mole is a unit of measurement for the amount of substance. Carbon-12 is used as a standard for defining the mole.
- **Match:** (b) → (e)

- **Metre (c)**: The metre is the unit of length. Krypton-86 was used in the definition of the metre based on the wavelength of light emitted by this isotope.
- **Match:** (c) → (h)

- **Kilogram (d)**: The kilogram is the unit of mass. The standard for the kilogram was originally defined using a platinum-iridium cylinder.
- **Match:** (d) → (f)

4. **Final Matching:**
- (a) Second → (g) Cs-133
- (b) Mole → (e) Carbon-12
- (c) Metre → (h) Kr-86
- (d) Kilogram → (f) Platinum-iridium

### Summary of Matches:
- (a) → (g)
- (b) → (e)
- (c) → (h)
- (d) → (f)