The following data for six months were collected from a factory:

Month Electricity

Cost Machine

Hours

June $$45,0004,540$

July $23,0003,380$

August $32,0003,870$

September $43,0004,345$

October $22,0003,200$

November $46,2004,680$

Select the correct set of high and low months.

a$.$ High: October; low: September

b$.$ High: June; low: October

c$.$ High: November; low: October

d$.$ High: August; low: October