The word “range” means “the area covered by or included in something.” For example: "a guide to the range of debate this issue has generated"
Option B: “Expanse” means “a wide continuous area of something." This is closest to the meaning of "range". Hence, this is the correct option.
Option A: “Level” means “a horizontal plane or line with respect to the distance above or below a given point.” This is a completely different meaning. Hence, this option is incorrect.
Option C: “Grade” means “a particular level of rank, quality, proficiency, or value.” This is a completely different meaning. Hence, this option is incorrect.
Option D: “Standing” means “position, status, or reputation.” This is a completely different meaning. Hence, this option is incorrect.