
Based on the illustration, the people who will stay dry are the ones who are actually under the umbrellas:
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The person holding the large umbrella (second from the right) appears to be fully covered.
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The person on the far right also seems to be standing under that same large umbrella’s canopy, so they should stay dry as well.
The two people on the left are likely to get wet:
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The person on the far left is holding an umbrella, but it’s tilted away from them and doesn’t seem to cover their body.
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The person next to them (hooded jacket) has no umbrella coverage at all.
So the dry ones are the two on the right, under the large umbrella.