Need a detailed self explanatory responses for the following:-

A) What are some of the empirical evidences that can provided to support the statement "migration boosts trade and suggests that there is a complementarily between migration and trade.

B) What are the comparative or absolute advantages that a migrant can can have on the basis of general trading skills or specific trading skills.

C) Suggest some recommendations that should be considered on the immigrant policies that could benefit both the immigrants as well as the countries who take up immigrants for their country's development.