The hoods over galley ranges present what major hazard?

A
Grease collects in the duct and filter and if it catches fire is difficult to extinguish.
B
In order to effectively draw off cooking heat they present a head-injury hazard to a person of average or more height.
C
They inhibit the effective operation of fire fighting systems in combatting deep fat fryer or range fires.
D
They concentrate the heat of cooking and may raise surrounding flammable material to the ignition point.
E