Please help and NO LINKS I WILL REPORT YOU IF ITS A LINK Which sentence contains gender-neutral language?

A.) The firemen loaded their equipment and started up the ladder.
B.) The stewardess helped load passengers onto the plane.
C.) A company is looking to replace the chairman of the board.
D.) Recycling helps preserve the Earth for all humankind.

D, it's the only one that doesn't specifically use a gendered word (firemen, stewardess, chairman)

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explanation:

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samuel gompers was an extremely important person in the american labor movement, being him an employee all his life he devoted himself to fight for the rights of his pairs, he believed they all had the right to have better thing and that they all were working for them but the factory workers were greedy, ambitions and socialist people for him who he didn't have a good concept of.

he gave so many speeches and led so many strikes and protest to fight for equality which he considered employers didn't want to accept, so he had an absolutely negative opinion of them.