a) two electrons in the antibonding molecular orbital offset the effect of the two in the bonding molecular orbital
or
b) no molecular orbital can form because He is 1s shell is full.
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I'd be tempted to say A but I'm usually wrong.
In my simple mind, the MO diagram would suggest A to be the case assuming that the instability of the antibonding MO compared with the two He AOs perfectly matches the stabilisation of that the bonding MO gives compared with the He AOs.
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