Which word below is the plural of mortality?

The noun mortality can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be mortality. However, in more specific contexts, the plural form can also be mortalities e.g. in reference to various types of mortalities or a collection of mortalities.

boccaccio employs the voice of his narrator dioneo to represent his ideas on the tension between masculinity and femininity.  while dioneo excites the members of the brigata and recognizes women for their unique skills and independent ideas, he concludes the decameron with a story reminiscent of the society from which these young aristocrats escaped, revealing misogynistic overtones.  dioneo boccaccio is able to explore the gender disparity which is inherent in 14th century florentine society.