Martha has 4 dogs and 4 cats. She takes each animal separately for a daily walk. She can take the animals for a walk to the park or to the barber shop. How many different options for a walk with a single animal does Martha have?  Choose the correct choice from the following choices:
A) 8
B) 9
C) 16
D) 18
E) 20
4 dogs, 4 cats; park/barber shop   1 dog - 2 options - either park or barber shop, so, 4 dogs - 8 options and 4 dogs - 8 options.   Total = 16 options.   16
<result>C</result>
Martha has 4 dogs and 4 cats. She takes each animal separately for a daily walk. She can take the animals for a walk to the park or to the barber shop. How many different options for a walk with a single animal does Martha have?