Match the following effects List-I with their meanings given in List-II.
| List-I | List-II |
| a. Placebo effect | 1. Self fulfilled prophecy |
| b. Hawthorne effect | 2. Rating error due to attribution to single trait |
| c. Pygmallion effect | 3. Belief system |
| d. Halo effect | 4. Controlled behaviour under observation |
A. a-3, b-4, c-1, d-2
B. a-1, b-2, c-3, d-4
C. a-4, b-3, c-2, d-1
D. a-3, b-4, c-2, d-1
Answer: Option A

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