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

which sentence contains gender - neutral language?\nthe firemen loaded their equipment and started up the ladder.\nthe stewardess helped load passengers onto the plane.\na company is looking to replace the chairman of the board.\nrecycling helps preserve the earth for all humankind.
Answer
Brief Explanations:
El término "humankind" es genérico y no se asocia con un género específico. Las otras opciones usan términos como "firemen", "stewardess" y "chairman" que son específicos de un género o se asocian históricamente con un género.
Answer:
Recycling helps preserve the Earth for all humankind.