A university cafeteria offers 1 flavors of pizza - pepperoni. If a customer has an option (but not the obligation) to add extra cheese, mushrooms or both to any kind of pizza, how many different pizza varieties are available ?  Choose one
A) 4  B) 8  C) 12  D) 1  E) 32
1 flavours * 1 choices = 1C1*1C1 = 1*1= 
<gadget id="calculator">1*1</gadget>
<output>1</output>
1=1
<result>D</result>
A university cafeteria offers 1 flavors of pizza - pepperoni. If a customer has an option (but not the obligation) to add extra cheese, mushrooms or both to any kind of pizza, how many different pizza varieties are available ?