Imagine You're Planning an After-Symphony Fundraising Party,and You Need a Life-Size

Imagine you're planning an after-symphony fundraising party,and you need a life-size grand piano cake.Or,you are a developer proposing a new shopping centre to a group of investors,and you want to serve a cake shaped like an architectural rendition of the centre.Is this impossible? No,you just need to contact Cecilia Villaveces Cakes.She actually built a life-size grand piano for a major gala.You can expect to pay anywhere from $75 to $10,000 for one of Cecilia's artistic creations,depending on complexity of design and size.She uses only the best ingredients,and no two cakes are ever quite alike.
-Refer to Specialty Cakes.Which of the following is the best example of a variable cost for Cecilia Villaveces Cakes?

A) life insurance on Cecilia
B) flour and sugar
C) ovens used for cooking cakes
D) interest payment to the bank