Which list includes only lifestyle factors that people can change to improve their health?
1 having many friends, parents with heart diseases, sleeping 8 to 10 hours a night
2 a family history of diabetes, lack of energy, thinking critically about health risks
3 knowledge of common risk factors, level of physical activity, ways of reacting to conflict
4 ways of interacting with others, changing the images in the media, resisting pressure from peers
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Lifestyle factors that people can change to improve their health are option 3. knowledge of common risk factors, level of physical activity, ways of reacting to conflict.

People can change their health or improve it by different kinds of lifestyle factors that allow people to make change them to improve accordingly, these factors are:

Thus, the correct answer would be - option 3.

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Explanation:

Actions that people could take to improve their health, must be those that can be changed, those that actually depend on the individual.

Knowledge of common risk factor is something that depend on the person who wants to improve, he or she can actually change this by reading more, investigating more about it from good sources.

Level of physical activity can be changed only by the person who wants to improve, that's who it works. It doesn't depend on other people, families or friends. If the person doesn't workout, won't improve.

Ways of reacting to conflict is also an individual experience. Reacting peacefully and resilient to conflict is a personal characteristic.

So, that's why the answer 3 is the right one. Because those factors are personal and improving them can affect positively health.