Explanation
- A
4, 3, 1, 2
4, 3, 1, 2. Puts iron before copper; copper is the smallest store.
- B
3, 4, 2, 1
3, 4, 2, 1. Puts potassium before sodium.
- C
3, 4, 1, 2
3, 4, 1, 2. Copper → iron → sodium → potassium (increasing mass in a typical 70 kg body).
- D
4, 3, 2, 1
4, 3, 2, 1. Iron first; potassium before sodium.
Summary. Official key is (c) 3, 4, 1, 2. Cu, Fe, Na, K. Also note: K largest — Intracellular cation; Na next — Extracellular; Fe ~4 g — Haemoglobin; Cu trace — Enzymes; milligrams.
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