Respuesta :
1. B --> mussels, oysters, clams, shrimp, carp and catfish is a list (series) of foods that has to be separated by a comma
2. B--> if you remove 'confine them to a pond or cage' its a normal sentence, so i think its b
1. B. Separates items in a series
One of the functions of commas is to separate series of items (things, actions, person, animals, elements, etc.) and this is exactly what it is doing when separating the items mussels, oysters, clams, shrimp, carp, and catfish in the sentence.
2. C. Separates items in a series
The sentence is describing a series of steps or actions which can also be referred to as items. The function of the comma here is to separate each of those items.