As part of her annual review of her​ company’s budgets versus​ actuals, Mary Gerard isolates unfavorable variances with the hope of getting a better understanding of what caused them and how to avoid them next year. The variable overhead efficiency variance​ (with direct​ labor-hours as the​ cost-allocation base) was the most unfavorable over the previous​ year, which Gerard will specifically be able to trace to A. Actual variable overhead costs below allocated variable overhead costs. B. Actual production units below budgeted production units. C. The standard variable overhead rate below the actual variable overhead rate. D. Standard direct​ labor-hours below actual direct​ labor-hours.

Stocks a, b, and c are similar in some respects: each has an expected return of 10% and a standard deviation of 25%. stocks a and b have returns that are independent of one another; i.e., their correlation coefficient, r, equals zero. stocks a and c have returns that are negatively correlated with one another; i.e., r is less than 0. portfolio ab is a portfolio with half of its money invested in stock a and half in stock b. portfolio ac is a portfolio with half of its money invested in stock a and half invested in stock c. which of the following statements is correct? a. portfolio ab has a standard deviation that is greater than 25%.b. portfolio ac has an expected return that is less than 10%.c. portfolio ac has a standard deviation that is less than 25%.d. portfolio ab has a standard deviation that is equal to 25%.e. portfolio ac has an expected return that is greater than 25%.