A bite of wisdom

What word describes a task that requires significant effort?

Abhorrent

Alacritous

Altruistic

Arduous

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arduous

1. involving or requiring strenuous effort; difficult and tiring

"an arduous journey"

Choice "A": Abhorrent % of users selected this choice.
Choice "B": Alacritous % of users selected this choice.
Choice "C": Altruistic % of users selected this choice.
Choice "D": Arduous % of users selected this choice.