Multi-select problem: How does the next paragraph end?

They then start to pour some vinegar down the sink. They watch it all go down the drain and then pour in some more vinegar. then they

Select from:
 (a). add some cream to the sink to clean it up..
 (b). add some salt and pasta to the sink..
 (c). start to add in more baking soda..
 (d). grab some baby powder and clean the sink..
(c).