Which of the following color adjustments creates a softer appearance?

Adding white to a color creates a lighter version of that color, which is known as a tint. This process softens the color's overall intensity, making it appear more pastel or muted. When white is mixed with a color, it reduces the brightness and vibrancy, resulting in a softer and often more soothing visual effect. This is particularly useful in floral design, where a softer appearance can create an elegant and delicate look.

In contrast, adding black darkens the color and can create a more dramatic or intense effect, while adding grey mutes the color but does not necessarily soften it in the same way white does. Adding complementary colors would create contrast and may intensify the color's overall effect rather than softening it. Thus, adding white is the most effective method for achieving a softer appearance in color adjustments.