The correct answer is option letter D (The football player did not seem seriously injured, yet as a precaution, the trainers moved him carefully). This sentence explains that even though the football player suffered a slight injury, the trainers took precautions to move him carefully. Option letter D best combines the ideas using the conjunction “as” to connect the result of something with its reason and the conjunction “yet” meaning ‘but’ or ‘nevertheless’ (the player was not seriously injured, BUT the trainers took precaution to move him carefully). The rest of the options (A, B, and C) do not clearly develop the relation between the two ideas mentioned before.