In the diagram, ${S_1}{S_1}$ and DD represent the original supply and demand curves for an agricultural product.
Bad weather then reduces supply to ${S_2}{S_2}$.
The government does not allow the price to rise above OP1.
How much of the product will the government have to supply from a buffer stock if demand is to be met?

1 )
$O{Q_1}$
${Q_1}{Q_3}$
3 )
${Q_1}{Q_2}$
4 )
${Q_2}{Q_3}$
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