No personally animals should not be held in captivity, although yes some animals are safer while being held in captivity some zoos, particularly roadside attractions are extremely mismanaged and horrible for animal care. Animals suffer from neglect, small cages, etc. Animals love being in their natural habitat but many animals kept in zoos are forced to become domestic pets. Along with that up to 5000 animals are killed a year in zoos(Only in Europe).
After “because,” you always want to put an explanation.
B. Ask the reference librarian.
The librarian is there to help you find information. She or he knows what information you need should be where.