Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A company is experiencing economies of scale when:
Option A:cost per unit increases as output increases.
Option B:it is operating at a point on the LRAC curve where the slope is negative.
Option C:It is operating beyond the minimum point on the long-run average total cost curve.

Answer: B