A beta coefficient for a stock of 0.8 implies O a. an 8% decrease in the market will cause the return on this stock to be 8%. O b. a return of 10% on the market will cause the return on this stock to be 8%. O c. a return of 10% on the market will cause the return on this stock to be -8%. O d. an 8% return on the market will cause the return on this stock to be 10%