How does Wheatfield with Crows by Post-Impressionist artist Vincent van Gogh show the threat of a coming storm?

A.) The painting uses chiaroscuro, or a dramatic contrast in light and dark, to model the clouds.
B.) The painting uses the same intensely realistic colors as those of a storm that van Gogh observed.
C.) The painting has short, slashing brushstrokes in vibrant hues that intensify each other.
D.) The painting has the dramatic tenebrism of Baroque artist Caravaggio to highlight the objects.