$($Advanced analysis$)$ The demand for commodity X is represented by the equation P $=100\mathrm{.}2$ Q and supply by the equation P $=2+0\mathrm{.}2$ Q$.$ If demand changes from P $=100\mathrm{.}2$ Q to P $=70\mathrm{.}3$ Q$,$ we can conclude that

Group of answer choices

demand has increased.

demand has decreased.

supply will increase.

supply will decrease.