A "C-" passport is a is a fair travel document that provides access to many countries in Latin America and South East Asia (among other regions), A “C-” passport does NOT provide access to the Schengen area or most of the developed world.
To receive a "C-" grade a passport must have a Travel Freedom score (Passport Score) between 50 and 67.
Additional Analysis:
The Travel Freedom score of this passport is 20%-50% lower than its simple count of visa-free countries. It means that this passport fails to provide access to the world's most attractive countries.