Use the Following Table to Answer the Questions

Multiple Choice

Use the following table to answer the questions :
Table 7-4 shows the shows the quantities of labor and capital required to produce various levels of output.

-Refer to Table 7-4.When the firm expands from 6 units of capital and 2 units of labor
To 12 units of capital and 4 units of labor,the production function exhibits:

A) increasing returns to scale.
B) constant returns to scale.
C) decreasing returns to scale.
D) diminishing marginal returns.