Price Lowering in Perfect Competition

Which of the following would occur if a single farm in a perfect competition lowered its price below the long-run equilibrium market price?

A) all other farms would lower prices too
B) it would not be maximizing profit
C) It would get a larger share of the market, and this would be profitable for it.
D) Other farms would be driven out of the industry.
E) other farms would enter the industry.

I chose D for this answer but then I considered A.  What do you think and why?  Thanks