Answer:
correct option is C. Economies of scale
Explanation:
we know here that Margaret expend his business by 20 more people
so we can say according to given this is Economies of scale because
Economies of scale is cost advantage that the business can be exploit by the expand scale of production in long run
and effect is reducing long run average cost of production over the range of output and lower cost is improvement of productive efficiency
it can feed in form of lower market prices
they give business competitive advantage in the market and lead to lower price but high profit
so we can say correct option is C. Economies of scale