An American cafeteria offers 3 flavors of pizza - chicken, Hawaiian and vegetarian. 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 the correct option.
A) 4	B) 8	C) 12	D) 9	E) 32
3 flavours * 3 choices = 3C1*3C1 = 3*3= 
<gadget id="calculator">3*3</gadget>
<output>9</output>
9=9
<result>D</result>
An American cafeteria offers 3 flavors of pizza - chicken, Hawaiian and vegetarian. 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 ?