Suppose a firm's production function can be specified asQ = 10KL.This firm's cost function exhibits

a.economies of scale

b.diseconomies of scale

c.neither diseconomies nor economies of scale.

d.economies of scale for output levels less than some level,Q1= 1/4, and diseconomies of scale thereafter.

e.we cannot determine based on the given information

I know the answer is A but don't know why. Please explain, thx!