I am hanging a ceiling fan and found the following when I dropped the
light:

1) There are 3 romex cables coming into the box. I will call them A,
B and C.

2) Ground wires (bare): A & B are twisted together and loose in
box...each wire is about 3 inches long. C is grounded to box.

3) Black wires: A & B are twisted together and capped off with a wire
connector. They are pushed back in box (unconnected). C is twisted
together with B's white wire and connected to black wire from ceiling
light.

4) White wires: A & C are twisted together and connected to white wire
from ceiling light. As mentioned above, B is tied together with C's
black wire from C and connected to black wire from ceiling light.

Is this, which appears to me as a mess, correct? Should I: (a) hang my
ceiling fan and maintain the current wiring arrangement, (b) use only
the wires on C and cap of A & B with wire connectors, or (c) call an
electrician?

Thanks.