Street lighting illumination uses the element

Options :
  1. Calcium
  2. Sodium
  3. Potassium
  4. Magnesium
Answer and Explanation :-

Answer: Option 2

Explanation:

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And what, incidentally, do you think integrity is? The ability not to pick a watch out of your neighbor's pocket? No, it's not as easy as that. If that were all, I'd say ninety-five percent of humanity were honest, upright men. Only, as you can see, they aren't. Integrity is the ability to stand by an idea.
-Ayn Rand The Fountainhead