Theoretical Essay on Conversion to Latin American Protestantism and the Case for Religious Motivation

This is to be done in question and answer format
This question relates to the article, Conversion to Latin American Protestantism and the Case for Religious Motivation.

Part A.  How did the authors define deprivation theory as applied to religious conversion?
Part B.  What sources of data did they use to test deprivation theory?
Part C.  Did the analysis of the data support or reject deprivation theory?
Part D.  How did the authors modify/change the theory?