Match the following:
| List-I (Variable) | List-II (Features) |
| A. Independent variable | 1. Randomisation |
| B. Dependent variable | 2. Counter -balancing |
| C. Carry over effect | 3. Measurement |
| D. Control of variables | 4. Active manipulation |
A. A-4, B-3, C-1, D-2
B. A-3, B-4, C-2, D-1
C. A-3, B-4, C-1, D-2
D. A-4, B-3, C-2, D-1
Answer: Option D

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