If employees working continuously while standing have increasing leg and lower back fatigue, which combination is more suitable?

Correct answer: Proper height surface rest breaks and safe floor

The direct answer is B: use a correctly adjusted work surface, rest breaks and a safe floor. Ergonomics means designing work, tools and surroundings to suit the worker’s body and reduce strain. For standing work, examine several causes: an unsuitable height may bend or stretch the back; standing continuously prevents recovery; and a hard or unsafe floor increases leg fatigue or slipping risk. B addresses all three. A is wrong because a hard floor and no breaks increase discomfort. C is wrong because longer work adds strain rather than preventing it. D is wrong because heavy tools increase the physical load. The correct plan may also include supportive footwear or changing posture, but B is the only suitable listed combination. Memory cue: safe height, safe surface and short recovery breaks protect standing workers.