A. Java
B. C
C. PHP
D. All of the above

Solution

B. C

Explanation

<p><span style="font-size: 14px;">The reference implementation of Python, called CPython, is written in the C programming language.</span></p><ul><li><span style="font-size: 14px;">Some other implementations exist:</span></li><li><span style="font-size: 14px;">Jython – written in Java</span></li><li><span style="font-size: 14px;">IronPython – written in C#</span></li><li><span style="font-size: 14px;">PyPy – written in RPython</span></li></ul>