You hold a portfolio consisting of a $5,000 investment in each of 20 different stocks. The portfolio beta is equal to 1.12. You have decided to sell a coal mining stock (b=1.00) at $5,000 net and use the proceeds to buy a like amount of a mineral rights company stock (b=1.25). What is the new beta of the portfolio? Select the correct answer. a. 1.1285 b. 1.1445 c. 1.1325 d. 1.1405 e. 1.1365