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The correct answer is A.
You should never rub ice-cold hands with snow! That just makes things worse. Your fingers get cold because the blood vessels have contracted because of the low temperatures, which means that your fingers are not supplied with a sufficient amount of warm blood.
It’s better to hold your hands under warm water as quickly as possible. If your fingers are very cold this can be painful to begin with. You’ll have a feeling of pins and needles.
If you don’t have the opportunity to warm your hands this way, swing your arms round like a propeller for about 30 seconds instead. This forces the blood into your hands and fingertips and they’ll soon warm up. To keep your hands warm you can also put them between your thighs or under your armpits, because your body temperature is highest here.
On really cold winter days it’s easy to get frostnip often without even noticing it. It’s therefore important to look out for any warning signs and to check children in buggies regularly. First symptoms of frostbite are white patches on the face or a white nose tip. If these symptoms occur it’s important to protect the cold areas and to get somewhere warm as quickly as possible. You only have to consult a doctor if blisters appear on the skin after the person has warmed up.