Answer:
The CHILD walked her DOG.
Explanation:
Here are some examples of a common noun:
People: mother, father, baby, child, toddler, teenager, grandmother, student, teacher, minister, businessperson, salesclerk, woman, man
Animals: lion, tiger, bear, dog, cat, alligator, cricket, bird, wolf
Things: table, truck, book, pencil, iPad, computer, coat, boots,
Places: city, state, country, continent, coffee shop, restaurant, park, zoo