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 kilograms of direct materials used in March to produce output totaled:

a) 12,500 b) 23,500 c) 24,500 d) 25,500