Which monochromatic colors did the artist use in this painting?

Responses

green, light green, dark green

green, light green, dark green

dark green, dark blue, dark gray

dark green, dark blue, dark gray

light green, light blue, gray

light green, light blue, gray

yellow, yellow-green, green

yellow, yellow-green, green
Photograph of painting by Albert Bierstadt titled Majesty of the Mountains

Based on the responses provided, it seems that the monochromatic colors used in the painting are green, light green, and dark green.