What was the purpose of the monopolies of salt and iron

I assume you mean in the past, and not the near past, but something like a century ago. Salt was a precious commodity used for preserving meats longer as people couldn't freeze it; plus, it added flavor to dull, unseasoned food. Iron is a strong alloy used in lots of things, and a century ago, people loved METAL machines that could get work done faster.

Answer – A

One very important thing that a psychologist must bear in mind when using the "three Ds" to classify abnormal behavior is that, none of the criteria by themselves are necessary or sufficient to classify a behavior as abnormal.