The 3 routes shown are from the North (Bangor / Caernarfon direction).
Option A (red): About 4 minutes longer than B but pretty and straightforward!
Option B (green): Sat Nav will probably suggest this way but it’s a single track lane with passing places. You may want to avoid this.
Option C (purple): No more than 2 minutes longer than B and very straightforward.
If you’re travelling from the other direction, you’ll pick up Option C at Tremadog roundabout.