A genetic engineering experiment resulted in a new haemoglobin variant which exists primarily as dimers in solution. Based on the oxygen saturation curves of the variant (dashed line) and normal haemoglobin (solid line), it can be inferred that

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1. Athe variant has a higher affinity to oxygen and shows non-cooperative behaviour.
2. Bthe variant has a higher affinity to oxygen and shows cooperative behaviour.
3. Cthe oxygen dissociation of the variant is less than 10 % at 20 mm of Hg .
4. Dat sea level ( 150 ~mm of Hg ), animals with this variant of haemoglobin can survive better than the ones with