Hello, people. First things first. The idea behind angel dusting is that it is a deceptive practice that seeks to make a claim that is true technically but not in any meaningful way.
A) A laptop that claims to have the longest battery backup, actually has a backup just 10% longer than is provided by its closest competitor
This is a worthy claim and is backed up (pardon the pun) properly with a significant 10 percent increase.
(B) A book that claims to cover all the concepts of Organic Chemistry actually provides just one example of each concept
I was tempted by this one. But if you think about it, the book may be incredibly detailed and provide an example of each concept as well. Ask yourself if you would feel deceived if you bought such a book. Yellow flag this and move on.
(C) A vitamin capsule that claims to contain 23 vitamins and amino acids contains less than 3% of each
Well, this is a little murky. Let's suppose you read that a capsule contains 23 vitamins. Even if all of them had an equal share that's roughly 4 percent each. So, is less than 3 percent each that bad? Yellow flag this one.
(D) A protein shake that claims to contain a magic ingredient that can make muscles grow faster, only contains 20% of this ingredient’s daily recommended intake
20 percent of an ingredient's daily recommended intake is quite significant. I understand why people may consider the magic ingredient part dubious, but even then it is not dubious in terms of angel dusting. Angel dusting is a deceptive practice not an untruthful one.
(E) An apartment that claims to have used Italian marble for its flooring has used exactly one slab of Italian marble and the remaining ninety-nine slabs of regular marble.
Bingo! This clearly smacks of that deception, a deception you cannot technically say is untrue but would leave you clenching your teeth if you ever found out!