Use the Information Below to Answer the Following Question(s)

Use the information below to answer the following question(s) .
Robb Industries Inc. (RII) , developed standard costs for direct material and direct labour. In 2016, RII estimated the following standard costs for one of their major products, the 10-litre plastic container.
During June 2017, RII produced and sold 5,000 containers using 490 kilograms of direct materials at an average actual cost per kilogram of $32 and 250 direct manufacturing labour-hours at an average actual wage of $15.25 per hour.
-June's direct material efficiency variance is

A) $320 unfavourable.
B) $300 favourable.
C) $300 unfavourable.
D) $320 favourable.