the safest utility knife has what type of blade?\no plastic\no replaceable\no folding\no self - retracting

Brief Explanations:

A self - retracting blade automatically retracts into the handle when not in use, reducing the risk of accidental cuts. Plastic blades may not be as effective for many utility tasks, replaceable and folding blades still pose risks if not properly secured.

Answer:

D. self - retracting