The accountant prepared the following variances for management to review:\ $3.500 Favorable Price variance, $2,500 Unfavorable Quantity Variance,\ $1,500 Favorable Rate variance and $2.000 Unfavorable Efficiency Variance.\ The most likely explanation of the above variances is that\ O the company may have assigned more experienced employees this month than originally planned\ O lower-quality raw materials were used than were planned which created problems\ O employees worked more efficiently as expected to accomplish the job\ higher-quality raw materials were used than were planned