The only thing that is relatively C-like in Java is the syntax
...and if you take that as the definition of "C-based" then every language mentioned in TFS is "C-based" apart from Python.
R is even further away than Python. I would still consider Python being close in mindset to C. Compare mental gymnastics required for C/Java programmer to switch to Python, versus moving to Lisp, Haskell or Prolog.
While we can discuss how far Python is exactly from others in that family, Java is really, really similar to C++. Especially old java to old C++. Real difference starts when you start going into non-trivial template programming in C++ (visible in boost in some places), but your 'normal Joe' run-of-the-mill code is really same thing. Biggest difference in everyday use (memory management) is NOT what differentiates family of languages.