The most likely reason Rob drew a route that passed the drugstore is: D. The drugstore was near the functioning bridge across the river.
Of all the landmarks on the map, only the drugstore was close to the bridge that Rob's friends could take on their way to his house.
The drugstore which was on the same axis as Rob's school was also the only shop that anyone could pass on the route from the school to the house.
So, Rob had to include the drugstore in the map.
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