AUD/CAD – from mid-July pair is constantly falling. Price respects edges of a bearish channel at this time. Currently price is descending to new minima, which should mean continuation of declines, with nearest target at the lower edge. It seems that you should consider PUT option.
GBP/AUD – on H4 chart we see a downward trend and currently a correction is being initiated. Price breaks trend line and breaks out of the last range of volatility. It seems that we have at least an open road to vicinity of 1.66 i.e. the previous two lows. In this context, consider CALL option.