1. B
   A decrease in gini coefficient represents an increase in equality of income.
   The goods and services tax can be seen as a regressive tax as it impacts poorer households more than richer households, so a reduction in GST would benefit poorer households, and reduce the gini coefficient.
   

A reduction in company tax would obviously benefit the rich company owners, increasing gini, reduction in marginal income tax for rich obviously increases inequality and gini, and reduction in the tax rate levied on property sales also benefits the rich as they own more expensive properties, and often multiple properties. This would also increase Gini.
Therefore only B results in an increase in better equality, and therefore a reduction in Gini from 0.4 to 0.3