A project manager has been asked to provide an explanation regarding a $$2,220$ favorable flexible budget variance for materials. After performing further analysis, the manager determined that the materials price variance was $$1,700$ unfavorable, and the materials quantity variance was $$3,920$ favorable. Which option best explains these variances?A project manager has been asked to provide an explanation regarding a $$2,220$ favorable flexible budget variance for materials. After performing further analysis, the manager determined that the materials price variance was $$1,700$ unfavorable, and the materials quantity variance was $$3,920$ favorable. Which option best explains these variances?Purchasing department used a new supplier which resulted in a lower price for the materialsExcellent scheduling by the production department enabled purchasing department to reduce shipping costsPurchasing department purchased a higher$-$quality material, resulting in less wasted materialsHuman resources department failed to hire adequately trained workers, causing materials to be wasted