A veterinarian surveys 26 of his patrons. He discovers that 14 have dogs, 10 have cats, and 5 have fish. Four have dogs and cats, 3 have dogs and fish, and one has a cat and fish. If no one has all three kinds of pets, how many patrons have none of these pets?
Choose the correct choice from the following answers.
A) 5 B) 6 C) 8 D) None of these E) Cannot determined
7 + 4 + 0 + 3 + 1 + 5 + 1 + x = 26   21 + x = 26   x = 5 patrons have none of these animals   5)
<result>A</result>
A veterinarian surveys 26 of his patrons. He discovers that 14 have dogs, 10 have cats, and 5 have fish. Four have dogs and cats, 3 have dogs and fish, and one has a cat and fish. If no one has all three kinds of pets, how many patrons have none of these pets?