Question: How do I know much frosting I need for a cake?

  Options: 
 A. In general, we recommend a total of 5 cups of frosting for three 8- or 9-inch round layers and 4 cups for two layers. Here's how to divvy it up. Use 3/4 cup of frosting between each layer. Put 1 1/2 cups on top of the cake.
 B. In general, we recommend a total of 5 cups of frosting for three 8- or 9-inch round layers and 4 cups for two layers. Here's how to divvy it up. Use 3/4 cup of frosting between each layer. Put 1 1/2 cups on bottom of the cake.
Answer: A