Theory of Optimal Currency Areas
a) Increase in the size and frequency of AD shocks to the economy.>


More inclined would encourage more demand from other regional countries, which in turn supports the shortage of domestics demand


  b) Increase in the size and frequency of money demand shocks to the economy.>


Less inclined would be better since independent currency regime provides local goverment (ie. the central/state bank) more flexibility in controling supply and demand money in order to deal with money demand shocks


  c) Increase in the cultural similarities between the country and the country or region it is joining.>


More inclined should be a great idea in this case as countries in that region could exchange labor and goods at lower relative cost compared to remain local currency regime


  d) Decrease in capital mobility restrictions combined with an increase in immigration restrictions.>


More inclined to common currency is my answer. Common currency is not the same as establishing an OCA (Optimal Currency Area) so immigration is a less-crucial criteria than capital mobility in considering a decision of commmon currency.