A flagstaff 17.5 m high casts a shadow of length 40.25 m. The height of the building, which casts a shadow of length 28.75 m under similar conditions will be:

1. A Option A: 10 m
2. B Option B: 12.5 m
3. C Option C: 17.5 m
4. D Option D: 21.25 m

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