Match the following for PGR and their chemical nature and select the correct option.
`{:(,"Column I",,"Column I"),(A.,"IAA",i.,"Carotenoids"),(B.,"Kinetin",ii.,"Terpenes"),(C.,"ABA",iii,"Indole compounds"),(iv,"GA3",iv.,"Adenine derivatives"):}`

Options

A. `(A - iii) , (B - iv) (C - i) (D - ii) `
B. `(A - i) , (B - iii) (C - ii) (D - iv) `
C. `(A - iv) , (B - ii) (C - iii) (D - i) `
D. `(A - ii) , (B - i) (C - iv) (D - iii) `

Answer

To solve the matching question regarding Plant Growth Regulators (PGR) and their chemical nature, we will analyze each item in Column I and match it with the correct item in Column II.

### Step-by-Step Solution:

1. **Identify IAA (Indole-3-Acetic Acid)**:
- IAA is a type of auxin, which is primarily involved in plant growth and development.
- It is classified as an **Indole compound**.
- **Match**: A (IAA) → iii (Indole compounds).

2. **Identify Kinetin**:
- Kinetin is a type of cytokinin, which promotes cell division and delays senescence (aging) in plants.
- Kinetin is derived from **Adenine**, which is a nitrogenous base.
- **Match**: B (Kinetin) → iv (Adenine derivatives).

3. **Identify ABA (Abscisic Acid)**:
- ABA is known as the stress hormone in plants, especially during stress conditions.
- It is derived from **Carotenoids**.
- **Match**: C (ABA) → i (Carotenoids).

4. **Identify GA3 (Gibberellic Acid)**:
- GA3 is primarily responsible for promoting stem elongation and is involved in various growth processes.
- It is derived from **Terpenes**.
- **Match**: D (GA3) → ii (Terpenes).

### Final Matches:
- A (IAA) → iii (Indole compounds)
- B (Kinetin) → iv (Adenine derivatives)
- C (ABA) → i (Carotenoids)
- D (GA3) → ii (Terpenes)

### Correct Option:
Based on the matches, the correct option is **1**.