No - C extends B. B extends A. This is a single inheritance
hierarchy. Java only supports single inheritance.

Multiple inheritance  is where a class  inherits from two (or more)
classes from different hierarchies. A popular example is a pencil
with an eraser - if multiple  inheritance was available the qustion
was should you create a new class that inherits from both Class
Pencil and Class Eraser. The answer is that a pencil with an eraser
on the end is a subclass of pencil that 'has a' eraser.

Multiple-inheritance has been deprecated in OO circles for a long
time. In Java you can use interfaces i.e a pencil that has an eraser
would implement both the pencil and eraser interface.