Answer :
[tex]\begin{gathered} B\text{ = butter} \\ C\text{ = cheese} \\ A=\text{ caramel} \\ \\ S\text{ = small} \\ M\text{ = medium} \\ L\text{ = large} \\ \\ \text{ the ways are } \end{gathered}[/tex]
SB,SC,SA,MB,MC,MA,LB,LC,LA
there are 9 unique ways to order a bag of porcorn