A) Maps are useful because​

Maps are useful because they illustrate specific and detailed features of a given area, region, or an object. They represent features such as boundaries, topography, physical features, climate, and even economic activities.

Explanation:

Explanation:

Maps represent the real world on a much smaller scale. They help you travel from one location to another. They help you organize information. They help you figure out where you are and how to get where you want to go.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).