The last thing the girls did was (A) got ready to go to the zoo.
As the question at the last itself states that the girls got ready for the zoo.
Therefore, the last thing the girls did was (A) got ready to go to the zoo.
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Complete question:
Sue and Mary wanted to go to the zoo. Their mother said they could go after they finished their chores. First, they cleaned their rooms. Next, they mopped the kitchen floor. After that, they washed the family's car. Finally, they got ready to go to the zoo. What was the last thing that the girls did?
(A) got ready to go to the zoo
(B) washed the family's car
(C) mopped the kitchen floor
(D) cleaned their rooms