$\backslash$table$[[$Price$,$Quantity Demanded $($Units$)],[($Dollars per unit$),$Bert,Ernie,Grover,Oscar$],[0\mathrm{.}00,20,16,6,8],[0\mathrm{.}50,18,12,4,6],[1\mathrm{.}00,14,10,2,5],[1\mathrm{.}50,12,8,0,4],[2\mathrm{.}00,6,6,0,2],[2\mathrm{.}50,0,4,0,0]]$

Refer to Table $4-2.$ If these are the only four buyers in the market, then when the price increases from $$1\mathrm{.}00$ to $$1\mathrm{.}50,$ the market quantity demanded

a$.$ decreases by $1\mathrm{.}75$ units.

b$.$ decreases by $24$ units.

c$.$ increases by $2$ units.

d$.$ decreases by $7$ units.