Cozy Creatures expected to produce 5,000 Hazel the Hedgehog bed warmers. Hazel was so popular that Cozy Creatures sold 5,750 Hazels. Each Hazel requires 0.5 metres of cotton flannel. Cozy Creatues purchased 3,000 metres of cotton flannel and used 2,900 metres. The standard price for cotton flannel is $9.00 per metre. Cozy Creatures paid $13,500 for the cotton flannel. The materials price and materials quantity variances are:

a. $ 13,500 favourable; $1,125 unfavourable

b. $ 900 favourable; $900 unfavourable

c. $ 450 unfavourable; $225 favourable

d. $ 13,500 favourable; $225 unfavourable