The question about the types of cargo that have been found in the sunken ships is the least likely to be included as the topic in the research. Thus, option d is correct.
<h3>What is a topic?</h3>
Topics are the subject matter that is used as the theme for the textual information. They are used as a point and the heading to write the facts and information. While researching the shipwrecks and ships there are many questions to be dealt with.
The research can include questions that are related to the equipment used in diving, the ships that have sunk, and shipwrecks recorded in human history but the types of the cargo that have sunken the ships is not relevant topic to be included in the research.
Therefore, option d. types of cargo are not a relevant topic.
Learn more about topics here:
brainly.com/question/10541763
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