The diagram below shows the aggregate demand (AD) and two short-run aggregate supply (SRAS) curves for an economy.
All other things being equal, which one of the following is most likely to cause the short-run aggregate supply curve to shift from SRAS$_1$ to SRAS$_2$?

1 )
A fall in the size of the labour force
2 )
An increase in imports
3 )
An increase in the value of the multiplier
Lower world commodity prices
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