Answer: C
Step-by-step explanation:
20 people have a dog: 8 are yes dog/yes cat & 12 are yes dog/no cat
17 people have no dog: 10 are no dog/yes cat & 7 are no dog/no cat
[tex]\begin{array}{c|c|c|c}\underline{\qquad \qquad}&\underline{Cat}&\underline{No\ Cat}&\underline{TOTAL}\\Dog&8&12&20\\\underline{\ No\ Dog\ }&\underline{\ 10\ }&\underline{\quad 7\quad }&\underline{\quad 17\quad }\\TOTAL&18&19&37\end{array}[/tex]
