What led john dawson to begin using coal as a source of heat?
a.
he had an engineering degree and knew how hot coal would burn.
b.
he was told by a friend that coal could be sold to private homes for high prices.
c.
he discovered that coal burned hot during a summer wildfire.
d.
his twelve-room house required too much wood and he was tired of splitting wood.
select the best answer from the choices provided
a
b
c
d