Please help with a detailed explain, Thanks very much!

Cryolite uses a standard costing system to gauge results for their single product. 70,000 kilograms of direct materials were purchased for $385,000. Two kilograms of direct materials are needed to produce one unit of product. In March, the company produced 12,000 units. The standard cost allowed for direct material was $120,000, and there was an unfavourable direct materials efficiency variance of $2,500. The direct materials price variance for March is: Select one: O A. $25,000 favourable O B. $25,000 unfavourable O C. $35,000 favourable O D. $35,000 unfavourable