In the city of San Durango, 60 people own cats, dogs, or rabbits. If 30 people owned cats, 40 owned dogs, 18 owned rabbits, and 12 owned exactly two of the three types of pet, how many people owned all three?	Choose the correct choice:
A) 2
B) 4
C) 8
D) 12
E) 32
You are considering a case when cat dogs and rabbit are not exactly equal to 12 .   The solution shall be 60=30+40+18-12-2x   and hence x shall be 8.   Answer 8
<result>C</result>
In the city of San Durango, 60 people own cats, dogs, or rabbits. If 30 people owned cats, 40 owned dogs, 18 owned rabbits, and 12 owned exactly two of the three types of pet, how many people owned all three?