The term studia humanitatis means

a. the study of human faults.
b. the folly of man.
c. the study of human letters.
d. the history of man

D. History of man

Explanation:

The fifteenth century Italian humanists used the term Studia humanitatis to denote the scholarly and secular literary activities which that they thought to be essentially classical and humane studies. Rhetoric, poetry, moral philosophy, ancient Latin and Greek studies were known as Studia humanitatis.  

the revival of the study of the classical antiquity in Italy and western Europe in the 14th, 15th and 16th century was known as Renaissance humanism. It started in Italy and later spread to western Europe.

Humanism is contemporary to that period that emphasised the agency and value of human beings. It prefers evidence and critical thinking over acceptance of dogma or superstition.

d.) continue to rise rapidly