A company produces a blended drink product from two ingredients,Ingredient A and Ingredient B.Ingredient A is more expensive per litre than Ingredient B.During the most recent period,the company produced fewer litres of finished drink product than budgeted,and it used a larger than expected proportion of Ingredient A in the materials mix than expected.Which one of the following statements is correct about materials variances in the period?
A. The materials mix variance is adverse and the materials variances is also adverse
B. The materials mix variance is adverse but the materials yield varian cannot be measured with the available data
C. The materials mix variance is favourable and the materials yield variance is also adverse
D. The materials mix variance is favourable but the materials yield variance cannot be measured with the available data