which sentence contains gender - neutral language? the firemen loaded their equipment and started up the…

which sentence contains gender - neutral language? the firemen loaded their equipment and started up the ladder. the stewardess helped load passengers onto the plane. a company is looking to replace the chairman of the board. recycling helps preserve the earth for all humankind.
Answer
Answer:
Recycling helps preserve the Earth for all humankind.
Brief Explanations:
The first three sentences use gender - specific terms ('firemen', 'stewardess', 'chairman'). 'Humankind' in the fourth sentence is gender - neutral.