Answer:

A. Physical hazard

Explanation:

hope it helps

pabrainliest

Answer:

C. Ergonomic Hazard

Explanation:

Ergonomic hazards are physical conditions that may pose risk of injury to the musculoskeletal system, such as the muscles or ligaments of the lower back, tendons or nerves of the hands/wrists, or bones surrounding the knees, resulting in a musculoskeletal disorder (MSD)

and since the question is working on a computer and experiencing a backpain was somehow related to skeletal pain I can confidently say that this ergonomic hazards

For more information and knowledge about the question here are my reference:

• https://www.comcare.gov.au/safe-healthy-work/prevent-harm/ergonomic-hazards