Can you post the actual question with the shown sentences?
Cathedral definition. A Christian church building in which a bishop has his official seat (cathedral is Latin for “chair”). A cathedral is usually large and imposing, and many cathedrals are important in the history of architecture. (See Chartres, Notre Dame de Paris, and Saint Paul's Cathedral.)
Nouns are actual things or objects. From that you know that skin is a thing, lobsters are things and claws are things so the answers are C D and E
The first sentence is correct the coma is in the right place before the noun