Final answer:
The longest path Anna can choose in the park with nine 100m paths is 700m.
Step-by-step explanation:
To determine the longest path Anna can choose in the park, we need to find the path with the maximum distance. Given that there are nine 100m paths, we can compare the distances of each path to find the longest one.
For option a, the distance for Path A is 6m, Path B is 4m, Path C is 12m, and Path D is 7m. The maximum distance among these paths is 12m, which corresponds to Path C.
Therefore, the longest path Anna can choose is 700m (Path C).