Sonar and satellite imagery are the technologies that are useful for locating schools of commercial fish.
What do you mean by Technology?
Technology may be defined as the utilization of various tools and machines for the need and modification of practical aims of human life.
Sonar and satellite imagery are the only techniques that worked in deep rivers, oceans, and seas. These techniques help in the localization of the objects found deep in the aquatic ecosystem.
Therefore, the correct option for this question is A.
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