Which of the following words can be used to describe light touch actions?

The term "graze" is particularly appropriate for describing light touch actions because it conveys a sense of lightly brushing against a surface without applying significant pressure. The word suggests a gentle, fleeting contact, which aligns well with the concept of a light touch.

In contrast, the other options do not capture this nuance of a soft or delicate interaction. For instance, "gush" typically refers to something flowing out forcefully, which does not relate to a light touch. "Hack" often implies a more abrupt or harsh action, often associated with cutting or striking, which is also inconsistent with the idea of gentleness. "Gust," while it can denote a brief, strong burst of wind, does not relate specifically to touch or contact in a way that conveys lightness. Thus, "graze" stands out as the most fitting choice for describing light touch actions.