Answer:
Option D is correct one.
increase; enter; rightward; the same as
Step-by-step explanation:
Assume a constant-cost industry that is initially in long-run competitive equilibrium. An increase in demand will cause a(n) increase in prices and profits, and as a result, firms will enter the industry, causing the market supply curve to shift rightward, which, in turn, will eventually cause the equilibrium price to be the same as before.