Question

review the details below.

• avalanche forecasts are available from the american avalanche association.
• skiers and snowboarders can take an avalanche safety class to learn how to test snowpack stability, avoid dangerous routes, and use safety equipment.
• skiers and snowboarders can check current weather conditions prior to hitting the slopes.

choose the best topic sentence to introduce a paragraph containing these details.
skiers and snowboarders must be aware of snow conditions before going into avalanche terrain.
skiers and snowboarders should be able to recognize snow stability.
the best way to reduce the risk of being in an avalanche is to know how to avoid one.

Explanation:

To choose the best topic sentence, we analyze each option:

• The first option: "Skiers and snowboarders must be aware of snow conditions before going into avalanche terrain." The details include checking forecasts (related to snow conditions), learning about snowpack stability (a snow condition), and checking weather (affects snow conditions). This option encompasses all the details as they relate to being aware of snow conditions before entering avalanche - prone areas.
• The second option: "Skiers and snowboarders should be able to recognize snow stability." This only focuses on recognizing snow stability, but the details also include checking forecasts and weather, so it is too narrow.
• The third option: "The best way to reduce the risk of being in an avalanche is to know how to avoid one." The details are more about being aware of conditions (forecasts, safety class, weather) rather than specifically about avoiding avalanches. The details don't directly support this as the main idea.

Answer:

Skiers and snowboarders must be aware of snow conditions before going into avalanche terrain.