Hey, mate and thanks for posting on brainly.com.
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So let's look at it this way it is most likely not A) Fires aboard steamships because this is something that is not going to happen a lot. It may be B) Debris and other hazards so let's not take away this one. it may be C) Cost of the journey but l do not think this is what it is asking. SO we have D) Swift currents and sandbars and B) Debris and other hazards but l think it is D) Swift currents and sandbars. So the answer I think is D) Swift currents and sandbars. Hope l helped you have a fantastic day.
Heyneighbor out!
