Consider the following combinations of inputs and outputs-
| Labour | Capital | Output |
| 5 | 10 | 1 |
| 6 | 12 | 2 |
| 7 | 14 | 3 |
| 8 | 16 | 4 |
| 9 | 18 | 5 |
| 10 | 20 | 6 |
A. increasing returns to scale
B. diminishing returns to scale
C. constant returns to scale
D. increasing returns initially, followed by decreasing returns to scale
Answer: Option C

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