How do I make a 6 LEDs Parallel circuit
A &amp; B are electronically the same. Position does not matter. 

C is not always recommended. The diode with the lowest Vf will set the voltage across the parallel leds. If you badly mismatch them,  you will get one diode that conducts more current than the others and can lead to one burning out then the rest following. This is really overblown  (pun totally intended) fud. Parallel leds with a single resistor is common. Just match the leds for brightness by eyeballing them, then confirm that the voltage across them are fairly identical. For one off projects this is enough. All it requires is careful selection of parts.

A/B is ""safer"" but C requires less parts. You are fine as is.