Which of the following statements regarding unsystematic risk is accurate?

A$)$ It is related to the overall economy.

B$)$ It is measured by standard deviation.

C$)$ It can be effectively eliminated by portfolio diversification.

D$)$ It is compensated for by the risk premium.

E$)$ It is measured by beta.

Given a monopolistically competitive firm we know that in the long run they break even because other firms are allowed to enter this industry $-$ given $P=50-2Q$ and $TC=100+2Q+Q^2.$ What is the long run price and output for this firm?