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Option 1 : 1978
Calculation:
| Years | Quantity in Barrel | Value in crores rs |
| 1975 | 100 | 150 |
| 1976 | 75 | 150 |
| 1977 | 150 | 330 |
| 1978 | 160 | 400 |
According to the question,
The value of India's export of crude oil was 400 in the year 1978
∴ The value of India's export of crude oil was the highest in 1978 years.
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