![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
When a firm experiences constant returns to scale,
A.
long-run average total cost is unchanged, even when output increases.
B.
long-run marginal cost is greater than long-run average total cost.
C.
long-run marginal cost is less than long-run average total cost.
D.
the firm is likely to experience coordination problems.