The high efficiency in which amino acids from newly degraded cellular proteins are reused within cells for new protein synthesis explains why

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The question asks why there is high efficiency in reutilizing amino acids from newly degraded cellular proteins for new protein synthesis in cells. 
Option 1: 'the protein requirement for adults is so high' — This is inconsistent with the idea of efficient recycling. If amino acids are being reused effectively, the need to obtain large amounts of dietary protein would be reduced, not increased. Therefore this statement overstates the necessity and contradicts the recycling concept. 
Option 2: 'the protein requirement for adults is fairly low' — This aligns with the principle that intracellular proteolysis supplies a readily usable pool of amino acids for new protein synthesis, lowering the net dietary protein requirement. The efficient reuse minimizes the amount of new amino acids that must be imported from the diet on a daily basis. 
Option 3: 'the protein requirement is very difficult to obtain in the diet on a daily basis' — The notion that dietary protein is hard to obtain daily ignores the buffering effect of internal amino acid recycling; while diet can vary, the recycling mechanism itself reduces sensitivity to daily intake fluctuations. This makes the statement inaccurate in the context of efficient reuse. 
In summary, the contrast among the options centers on whether intracellular recycling reduces or heightens the dietary protein need. The most consistent view with high amino acid reuse is that adults require fairly less protein from diet, rather than a very high or consistently hard-to-obtain amount.

11:709:255:01 NUTRITION AND HEALTH Lecture Q4 - Amino Acids and Protein - Part 1 - S2025

The high efficiency in which amino acids from newly degraded cellular proteins are reused within cells for new protein synthesis explains why

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